I got the 2nd edition of Hoppenfeld's Surg Exposures brand new in the shrink-wrap for ~$70 from half.com. I think that site might be affiliated with eBay. It's not the newest edition, but it has had everything that I've needed as a 4th year med student. I also got a used copies of Hoppenfeld's Phys Exam and Ortho Netters from amazon.com. You just search for the item you want, then you'll have the option to buy it new or used if it's available.
Hope that helps.
JS