I was looking forward to grabbing borderlands and dragon age from my local blockbuster last thursday but they didn't have it. Instead I just grabbed the only left for dead 2 copy sitting on the shelf for $9.99.
Base Value:
COD 4 - $3.0
Mercenaries 2 - $2.50
50 Cent: Blood on the Sand - $7.0
.. after trade 3 get $10 more deal, I got $22.50 trade-in total. Bought those games $10 each so not bad at all. Thanks OP for posting this deal.