Replying to Broken brake, what are my options?

Don't come and just say "bend it back you pussy" or something, cus that's impossible in my situation. I've got the old style turntable rossi axial 14's, and the whole brake mechanism has broken, including the thing you step on. I don't know when or where it broke, and I don't know where the piece is. I asked at my local shop, and they should be able to fix it if i can get that piece. Is there anywhere I could buy one, and if so how much would it cost?