This should be in the classifieds, you won't need to wait that long before you can post there.
Bro, Clack, nubb, and Hipster (Punksdead) have all made BS sculpts. There are other people who have made blanks but I don't know who has. As far as the Mario, final fantasy, mega man, etc. goes you may need to look at shapeways but I'm not sure if a 3D printed BS stem would work that well or if anyone has designed one.