<p>In my experience, buying off amazon is great. I look for the sellers with a record of positive feedback and I chose the ones with the lowest prices. I think ebay would also be a good choice. Remember that there are options out there to save by renting your books and saving around half the cost of a textbook.</p>
<p>There are search engines that compare prices from hundreds of bookstores. It’s a lot better than just going to amazon or half (and most of the time books on amazon marketplace are cheaper than amazon, so prime is useless). I use bookfinder4u.com</p>