If you want new, most company websites have a dealer location chart, and include internet sales. If you're looking for some classic iron-- and if you know exactly what you're doing; ie you would recognize an authentic if you saw one-- you can try eBay. I do it all the time and haven't been burned yet. Given the advent of the really good VV/VW mods now available, there's some original high-dollar mechs going for a song nowadays. I've been stocking my collection for some time. thevapetrader.com offers free registration, nominal advertising fees for sales and has a dispute resolution system. And probably the very best option is to get verified to buy and sell on the classifieds here.