I really think you're prices are even a little low! I think you need a public place to sell them. Check your local city or art gallery, promote your work through there and on the sly if they are fans/freaks/phans promote your stickers/ bookmarks ect then!
Fanart isn't given the same kind of credit as Orginal Art, I think it's a shame because you're work is very well done and still in your style!

<3 with lots of <3