gibson saddles

Hello, I've lost a saddle - I think that's what it's called, one of the six pieces on the bridge with little grooves the strings rest on. I've tried a few shops and they've told me I'll have to buy a new bridge. Has anybody any spare ones or know where I can get one. It's for a Epiphone Sheraton though any Gibson electric saddle should do. Thanks, John johhwpoliver@hotmail.com