It's hard to find parts for those bows. You're best bet is knowing what kind of bow you have, and what kind of cam it uses (most makers name their cams). You must have strong google-fu. If you can put a name on the cam you're looking for, you might just luck out. Hell, maybe a machine shop will know how to fix it.
I got into bowhunting a few years ago out of the blue. It was practically an impulse buy with fairly little knowledge, but I got a good entry level used setup for $200 on ebay. I shot it a few thousand times and then I got another, better bow, used and naked for $200 (ebay again). I couldn't get it to shoot, but Cabela's tuned it for free and made all the difference. Just saying, it doesn't have to be all that pricey to get started if you don't get that other bow running.
The challenge of bowhunting and muzzleloading has been so much more rewarding for me than centerfires, that I haven't bought a rifle tag since I started.