smartstar, do you have a specific question about them (selling, buying, etc.) or are you just looking for hock?
If you are interested in buying, I had some good experience with amazon refunds and reimbursement for fraud. Books are easier to find at half.com
If you are interested in selling, I have found it very easy to sell on ebay and half.com.
If you are just looking for hock then you are better off starting a thread “coke or pepsi” or “beer mayim or mayim chaim”.