SRS, filk is science fantasy themed folk music. Popular themes are star wars, star trek, etc. I have a wonderful Manley Wade Wellman filk cd from the Silver John stories.
I'll have to look through your sales list myself!
As for selling, my number one suggestion would be listing them for sale on discogs, Amazon and eBay. Discogs to me is the best route and personal favorite because, assuming the CD is in their database already, its as simply as listing it for sale and adding condition info. If not, making a page for it is fairly self explanatory. Amazon and eBay are other routes but they'll be more tedious to set up