http://www.ebgames.com/ebx/categorie...&ordersort=asc
Jewel Case Total Annihilation Kingdoms for $2.99! WOOT WOOT!
If there's an EB Games near you, you can sometimes get these titles a little cheaper there (and no shipping costs).
They also have some great titles for $20, like Hitman 2, Jedi Outcast, RTCW, Asheron's Call 2 to name a few.