Don - two sites that I use are efolk.com and CDstreet.com, both online "stores" where I have pages, for minimal sign-up fees. There the public can see your CD covers and click to buy them. The trick to success (absent major airplay) is to promote the hell out of your website at your gigs, and link it to those "store" pages, so that it's easy for buyers to get around.

It's also a good idea to let browsers hear soundbites (maybe 20-30 seconds) of the songs; but it's not a good idea to have complete mp3s for download.

All these are things I have been working on for my band. It's a continuing process. Unfortunately the marketing of music is a lot less fun than the making of it!

Good luck, and I'd love to hear your CD.
Michael