Oh, gosh, at least 2/3 or 3/4 of my stash is from eBay - I love, love, LOVE my eBay sellers! :)
If someone's f/b is less than about 99.5%, check their negs and neutrals. I just had a bad experience with a seller who hadn't shipped in a month and finally issued a full refund. If I had paid attention to the 98.1% f/b before I ordered, I wouldn't have bought from her. There are plenty of really GREAT sellers - no need to settle for lackadaisical service.
98.1% might be terrific on a math test, but it's a TERRIBLE eBay feedback rating.
I tend to go back to the same sellers over and over - they sell nice fabrics at great prices and they ship within two or three days of my paying for the order.