Shiny, new iPhones. Better than non-shiny, one-year-old iPhones, right?

With the sale floodgates open for Apple’s iPhone 6S and 6S Plus, we’re well into get-rid-of-your-old-iPhone season, and, as it turns out, people are trading in phones way faster than they used to.

That’s according to data collected by Boston gadget e-commerce company Gazelle, which buys and sells used electronic devices. Gazelle spokesman Brian Kramer said in September, the company saw a 390% increase in trade-in requests for iPhone 6 and a 347% increase for iPhone 6 Plus from the previous month.

“We’re seeing an acceleration in trade-ins of one-year devices.”

That help explains the next statistic Gazelle gave us: the percentage of people trading in one-year-old iPhones in September has increased to the point where it’s almost on par with people trading in two-year-old iPhones. Just take a look at these pie charts:

“We’re seeing an acceleration in trade-ins of one-year devices,” Kramer said. “In the end, a lot of it has to do with how people purchase or lease their phones. All these upgrade programs are a pretty big driver. September is always going to be a bigger month than August [for trade-ins] because September is when the new iPhone launch usually happens.”

How much money you can expect for trading in that iPhone 6 or 6 Plus? Here’s an idea of what to expect, according to Gazelle:

  • An iPhone 6 16GB model on Verizon, for example, originally costs $649, and its value will dip to about $310 in one or two years, meaning 48% of its retail value will be retained.
  • An iPhone 6 Plus 16GB model on Verizon, however, doesn’t retain as much of its retail value, but only by a couple of points, going from $749 to about $345 in one or two years.

Compared to Google’s Nexus 5, that’s pretty decent considering that Nexus 5’s trade-in value is about a quarter of what they originally cost.

If you’re trying to figure out the best way to sell your iPhone 6 or 6 Plus for cash, we sampled price quotes* across four ecommerce sites, Gazelle included. Take a look:

Gazelle

  • Apple iPhone 6 16GB (AT&T): $300 cash
  • Apple iPhone 6 64GB (AT&T): $305 cash
  • Apple iPhone 6 128GB (AT&T): $310 cash
  • Apple iPhone 6 Plus 16GB (AT&T): $325 cash
  • Apple iPhone 6 Plus 64GB (AT&T): $330 cash
  • Apple iPhone 6 Plus 128GB (AT&T): $335 cash
  • Apple iPhone 6 16GB (Sprint): $210 cash
  • Apple iPhone 6 64GB (Sprint): $220 cash
  • Apple iPhone 6 128GB (Sprint): $230 cash
  • Apple iPhone 6 Plus 16GB (Sprint): $240 cash
  • Apple iPhone 6 Plus 64GB (Sprint): $250 cash
  • Apple iPhone 6 Plus 128GB (Sprint): $260 cash
  • Apple iPhone 6 16GB (T-Mobile): $225 cash
  • Apple iPhone 6 64GB (T-Mobile): $235 cash
  • Apple iPhone 6 128GB (T-Mobile): $245 cash
  • Apple iPhone 6 Plus 16GB (T-Mobile): $250 cash
  • Apple iPhone 6 Plus 64GB (T-Mobile): $260 cash
  • Apple iPhone 6 Plus 128GB (T-Mobile): $270 cash
  • Apple iPhone 6 16GB (Verizon/unlocked): $310 cash
  • Apple iPhone 6 64GB (Verizon/unlocked): $315 cash
  • Apple iPhone 6 128GB (Verizon/unlocked): $320 cash
  • Apple iPhone 6 Plus 16GB (Verizon): $335 cash
  • Apple iPhone 6 Plus 64GB (Verizon): $340 cash
  • Apple iPhone 6 Plus 128GB (Verizon): $345 cash

TechPayout

  • Apple iPhone 6 16GB (AT&T): $312.50 cash
  • Apple iPhone 6 64GB (AT&T): $327.50 cash
  • Apple iPhone 6 128GB (AT&T): $342.50 cash
  • Apple iPhone 6 Plus 16GB (AT&T): $336.25 cash
  • Apple iPhone 6 Plus 64GB (AT&T): $351.25 cash
  • Apple iPhone 6 Plus 128GB (AT&T): $366.25 cash
  • Apple iPhone 6 16GB (Sprint): $245 cash
  • Apple iPhone 6 64GB (Sprint): $260 cash
  • Apple iPhone 6 128GB (Sprint): $275 cash
  • Apple iPhone 6 Plus 16GB (Sprint): $262.50 cash
  • Apple iPhone 6 Plus 64GB (Sprint): $277.50 cash
  • Apple iPhone 6 Plus 128GB (Sprint): $292.50 cash
  • Apple iPhone 6 16GB (T-Mobile): $262.50 cash
  • Apple iPhone 6 64GB (T-Mobile): $277.50 cash
  • Apple iPhone 6 128GB (T-Mobile): $292.50 cash
  • Apple iPhone 6 Plus 16GB (T-Mobile): $281.25 cash
  • Apple iPhone 6 Plus 64GB (T-Mobile): $296.25 cash
  • Apple iPhone 6 Plus 128GB (T-Mobile): $311.25
  • Apple iPhone 6 16GB (Verizon/unlocked): $332.50 cash
  • Apple iPhone 6 64GB (Verizon/unlocked): $347.50 cash
  • Apple iPhone 6 128GB (Verizon/unlocked): $362.50 cash
  • Apple iPhone 6 Plus 16GB (Verizon): $356.25 cash
  • Apple iPhone 6 Plus 64GB (Verizon): $371.25 cash
  • Apple iPhone 6 Plus 128GB (Verizon): $386.25 cash

SmartphoneTradeIn.com

  • Apple iPhone 6 16GB (AT&T): $315.19 cash
  • Apple iPhone 6 64GB (AT&T): $330.19 cash
  • Apple iPhone 6 128GB (AT&T): $345.19 cash
  • Apple iPhone 6 Plus 16GB (AT&T): $340.19 cash
  • Apple iPhone 6 Plus 64GB (AT&T): $380.21 cash
  • Apple iPhone 6 Plus 128GB (AT&T): $390.21 cash
  • Apple iPhone 6 16GB (Sprint): $221.21 cash
  • Apple iPhone 6 64GB (Sprint): $241.21 cash
  • Apple iPhone 6 128GB (Sprint): $261.21 cash
  • Apple iPhone 6 Plus 16GB (Sprint): $250.21 cash
  • Apple iPhone 6 Plus 64GB (Sprint): $260.21 cash
  • Apple iPhone 6 Plus 128GB (Sprint): $270.21 cash
  • Apple iPhone 6 16GB (T-Mobile): $251.21 cash
  • Apple iPhone 6 64GB (T-Mobile): $261.21 cash
  • Apple iPhone 6 128GB (T-Mobile): $271.21 cash
  • Apple iPhone 6 Plus 16GB (T-Mobile): $260.21 cash
  • Apple iPhone 6 Plus 64GB (T-Mobile): $276.21 cash
  • Apple iPhone 6 Plus 128GB (T-Mobile): $291.21 cash
  • Apple iPhone 6 16GB (Verizon): $325.19 cash
  • Apple iPhone 6 64GB (Verizon): $340.19 cash
  • Apple iPhone 6 128GB (Verizon): $355.19 cash
  • Apple iPhone 6 Plus 16GB (Verizon): $350.19 cash
  • Apple iPhone 6 Plus 64GB (Verizon): $365.19 cash
  • Apple iPhone 6 Plus 128GB (Verizon): $380.19 cash
  • Apple iPhone 6 16GB (unlocked): $335.19 cash
  • Apple iPhone 6 64GB (unlocked): $350.19 cash
  • Apple iPhone 6 128GB (unlocked): $365.19 cash
  • Apple iPhone 6 Plus 16GB (unlocked): $360.19 cash
  • Apple iPhone 6 Plus 64GB (unlocked): $375.19 cash
  • Apple iPhone 6 Plus 128GB (unlocked): $390.19 cash

uSell

  • Apple iPhone 6 16GB (AT&T): $272.70 cash
  • Apple iPhone 6 64GB (AT&T): $272.80 cash
  • Apple iPhone 6 128GB (AT&T): $300.80 cash
  • Apple iPhone 6 Plus 16GB (AT&T): $294 cash
  • Apple iPhone 6 Plus 64GB (AT&T): $294.65 cash
  • Apple iPhone 6 Plus 128GB (AT&T): $332.83 cash
  • Apple iPhone 6 16GB (Sprint): $213.60 cash
  • Apple iPhone 6 64GB (Sprint): $201.48 cash
  • Apple iPhone 6 128GB (Sprint): $250.66 cash
  • Apple iPhone 6 Plus 16GB (Sprint): $213.71 cash
  • Apple iPhone 6 Plus 64GB (Sprint): $249.83 cash
  • Apple iPhone 6 Plus 128GB (Sprint): $292.16 cash
  • Apple iPhone 6 16GB (T-Mobile): $196.56 cash
  • Apple iPhone 6 64GB (T-Mobile): $269.75 cash
  • Apple iPhone 6 128GB (T-Mobile): $333.66 cash
  • Apple iPhone 6 Plus 16GB (T-Mobile): $210.45 cash
  • Apple iPhone 6 Plus 64GB (T-Mobile): $267.26 cash
  • Apple iPhone 6 Plus 128GB (T-Mobile): $333.66 cash
  • Apple iPhone 6 16GB (Verizon): $278.64 cash
  • Apple iPhone 6 64GB (Verizon): $284.40 cash
  • Apple iPhone 6 128GB (Verizon): $324.72 cash
  • Apple iPhone 6 Plus 16GB (Verizon): $304.08 cash
  • Apple iPhone 6 Plus 64GB (Verizon): $332.83 cash
  • Apple iPhone 6 Plus 128GB (Verizon): $365.31 cash
  • Apple iPhone 6 16GB (unlocked): $285.60 cash
  • Apple iPhone 6 64GB (unlocked): $295.20 cash
  • Apple iPhone 6 128GB (unlocked): $292.16 cash
  • Apple iPhone 6 Plus 16GB (unlocked): $298.80 cash
  • Apple iPhone 6 Plus 64GB (unlocked): $323.70 cash
  • Apple iPhone 6 Plus 128GB (unlocked): $374.33 cash

*Price quotes are based on a phone being in good condition.