They just had a B2G1 free sale on used books and movies, and that went over really well. I ordered about 15 books myself. Shipping on books is free with them.
In terms of games, yeah, B2G1 is only good on the more expensive games. If you're looking to get a bunch of older, cheaper titles you may have missed, you're going to be paying out of your ass for shipping. I think shipping is $2.77 per item.