From what I can find H&M sells strings for solo cams at about $26 (low end of price range) up to $60 for Winner's Choice. This doesn't necessarily mean that WC is a better string. It just means that their's cost more.

You could also do a search for custom strings on www.archerytalk.com and come up with more choices. You might also ask at one or more archery shops in your area. You may run into one that makes good strings or know somebody around that does. Peersonally I'd put a complete set on the bow. Then you'll know what you have.

Don't forget that you'll have to have somebody install it so ask what that would cost, too.