Maybe you all know about this already, but I just found out about it, and went nuts:
http://www.ebgames.com/ebx/groups/15games50bucks/dreamcast.aspShipping was around $5 for 15 games. The games arrived like 3 days after I ordered them, and more than half of them had the original booklet/case. If you've bought used games at EB then you already know that they will have some minor scratches, and the odd game will not work. Out of around 35 games I've purchased 2 of them have failed on me (which I have returned to the store for a working copy).