Jacked-up s/h costs are a common scam on ebay these days. I've often found that on commercially-available items, I can often beat the average ebay total price for an item from an online store. Caveat emptor!
Case in point:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2767988964&category=3759
Total cost with shipping, $165.51. I just bought one of these new from buy.com for $164, and I just missed a sale at Circuit City for $119. Why take on the risk with a buyer on ebay when you can get it from a reputable store?