I don't know if there is already a thread about this but I couldn't see one.
I have had trouble with all ballet shoes having some leather on them...even canvas have leather soles...Grishko however, offer aforddable canvas and satin ballet shoes with an option to email them after purchase and request vegan soles!
Cynthia King is the only producer of vegan ready-to-wear ballet slippers. The slippers are made of canvas and synthetic soles. They are popular internationally in their light pink color and are now available in black in adult sizes.