I have to buy almost all of my currency online as there are no coin dealers who deal in much paper here. My only requirement is they must have a good reference and they must have high quality photos of both sides of the notes. Guy~
I have bought on line for several years, and have been pleased 99% of the time. When I find a dealer I am interested in I first place a small order to check out the quality and service. If I am happy then I do more business with them. I have found a few that don't get a secound chance. Bill G
I've had good luck with these two: http://vernpotter.com/VernPotter/Home.htm http://www.denlys.com/ Guy~
I have bought online. Heritage and TeleTrade auctions are a safe bet. eBay is dubious. There are many reputable dealers, check out this thread, I posted a bunch of links for everyone's reference, which is in NO WAY exhaustive: Currency Websites The greatest risk of buying notes online is that you cannot inspect them in hand. TPG slabbed notes make this easier but still not fool-proof.