Does anyone know of any place other than Amazon/ebay. It seems like Lots on eBay are my best bet and for newer stuff, I haven't found anything cheaper than Amazon.
New stuff, Amazon is the best I have been able to find. If you have a Half-Price Books in your area they are a good place to check, mainly when they have the coupons however. They do again starting this week for 40% off a single item, it is posted somewhere here on CAG.
Depending on what you're looking for, TFAW.com always has their Nick & Dent at 50% off and when you catch them on sale, they'll sometimes dip as low as 70-80% off (They usually do some big, big stuff for Black Friday). While these are called Nick & Dent, 95% of the time they're just overstock sell-offs and in brand new, shrink-wrapped condition.
great place to trade in your books, and then you get credits and get books from the existing list. Uses credits instead of $. My mom has used it for years and is always getting books from there for me and my kids.