I sell CD's on both Ebay and Bonanza and most of my business has been on Ebay, however a couple of times a month I have sold on Bonanza. I have it set up that if you want to buy from me I have to approve the order. That is good for both the buyer and the seller. One you know that the seller has seen the order and two I respond to you within 6 hours. I have not had any problems with my buyers and so far they haven't had any with me. If a seller wants to be successful in on line sales they need to communicate with their buyer.
Check out the sellers feedback, send them an email first. Give Bonanza a chance. Ebay too has their problems, it is just too big.