i could get you some, but they arent very cheap. the fish do like them more though, i have about 10 shells for my 2 gold occies and 2 pearly occies, they have selected the 4 neothauma shells out of the 10 and if scared will dart to them, not the snail shells. but they definitely arent necessary.
about 2.50 each unless you are buying alot then they are cheaper. shipping will be cheap since they arent alive or anything.
let me know if you want them.