i've just bought a bigger compressor, and so i can now use bigger stuff to do stuff with

but i'm stuffed because i can't get any of the bits for the air chisel, mine are all blunt after several days useage
anyone other than ebay for recomendations or can i get the bits i've got sharpened?
it's only 23 quid for a new chisel with 6 bits in it, but i'll end up getting loads of them the rate i'm currently going throgh them
cheers