They're listing sales for Cake Mania, Cooking Mama, The New York Times Crosswords, and Konami Classics for $9.99 each. I've played all four. Konami Classics and NYT Crosswords are great deals and well worth the money if you like old arcade games and crosswords, respectively. Cooking Mama is okay - $10's about the right price for it. And I don't really care about Cake Mania, but my girlfriend won't leave it alone, so your mileage may vary.
I actually usually get a good deal through EB. But I also tend to do a quick turnaround on games. i.e. Once I solve a game I have no desire to replay it. So since the game is erlatively new I can sometimes still get up to $25 for trade in credit.