I'm wondering which one is a better service and cheaper to buy from. Typically, we've used Amazon to buy books. We've been able to find many books for cents on the dollar. The other day, I had a friend who told me about half.com. It's ran by eBay, and you can not only buy books, but rent them as well. I'm curious if someone that's used both services has an opinion on which one is better? I don't know that I find renting to be an attractive option. You can go to your local library and rent a book for free. Any thoughts or opinions?