I buy on Ebay frequently and use PayPal and they charge nothing at all. Sellers pay the fees, but the few times I've sold on Ebay (mostly selling old cell phones) the fees have only been a couple of bucks. But like anywhere you shop or sell, it's important to be careful who you're dealing with and be wary. There's a few sellers that have setup "Ebay Stores" that sell excellent bicycling gear and have great selections - my favorite is "Buildyourbike" - and xtrajack is correct, there's a wide selection of "outdated" but still great bike stuff available. Generally the selection of items on Ebay are less expensive than online retailers like Performancebike and Nashbar (Example: NiteRider MiNewt 600 Cordless is between $100 and $110 at Ebay, and is $149 ay Nashbar/Performance. Look at auction 160695459037), and the selection is larger. For me that's important because one of my bikes is an old Trek 520 (1985) that has center-pull brakes, 27" wheels, and several other "outdated" features that Nashbar/Performence cannot help me with, but I can find parts on Ebay easily.