[quote name='Capitalizt']What's the verdict on Gamestop's prices? I don't have an Edge card and would like to buy 10-15 Xbox games to start my Xbox 1 collection. With the B2G1 sale, are the prices better than you can get on Ebay or Goozex?[/quote]
It depends upon what you're looking for. Personally, I would do the following...
(1) Make a list of every XBox game you want to purchase.
(2) Separate the list into BC games and Non-BC games (in case you only have a 360).
(3) Make three or four separate columns next to each game. Label these
eBay,
Goozex,
Amazon, and
EB/GS.
(4) Find the best price for each title through each of the four stores, keeping in mind that all but
EB/GS can potentially fluctuate slightly over the course of a day.
(5) Use the search function on
EB/GS's site to see if the titles you want are available locally. Mark down which can be found where.
(6) Compare all prices, find the deals that are worthwhile, keep in mind that you can use the 20% off (plus 10% Edge if you have it) to knock down the price or the B2G1 free in your calculations. If you luck out, maybe a cashier will let you get both.

(7) Buy!
Now, be sure to convert Goozex points and whatnot into dollar values for your comparison, just to make things slightly easier. This is a long process, of course, but if you do this you're more than likely going to spend the least amount of gas in order to get the most games out of your money.
Also, don't be afraid to look at every price tag of games you are interested in when you're in EB/GS. You never know if you will find one that has been relabeled or carried an older (and lower) price. It's rare but you just never know.