"Earn a quick bit of cash by taking advantage of this Amazon glitch"
I usually wouldn't take the time to post this. The strategy is rather obvious, but this provides a nice walkthrough for a first time "reseller". More importantly, this glitch has been around for several months now. I have traded in the max amount of 2 games (if only I knew before that there was a max!) so I figured I would share with everyone else. Consistently the Amazon Trade-In Price has been higher than the lowest used listing price by as much as $6. Similar effects have been seen with the Left 4 Dead Xbox 360 game, but not with any of the special/DLC versions. Currently the difference is only a few dollars, but that doesn't hurt if you are planning to buy some textbooks in the upcoming months. If you want a bigger payout search eBay or Craigslist to pick it up even cheaper. Amazon isn't the only one to greatly undervalue this game's worth. Even if you own the game it is a great time to sell or trade it in for more than it's worth!