I've sold for over ten years on ebay but haven't done much recently because of the fees and the fact that paypal takes a big chunck too (wondering if everyone realizes they are "double dipping" - owned by the same company).
I do have a studio on ArtFire and sell things there every once in a while there is a link under my signature. We have had really good luck on Craigslist (both buying and selling) so we do that too. Recently moved to a new area and will be "stocking" up on things to hopefully participate in the holiday fairs.
We've had a website for years selling electronics but haven't done anything there in the past couple of years so I convinced my DH to let me revamp it and fill it with sewing stuff (I've probably collected over 500 clothing patterns and have lots and lots of books and cross stitch pamphlets :-|)