I have some 07 murray bindings and the boa system broke on one of them should i just get some new ones or can it be fixed?

Take them to your local Hyperlite Dealer. Often they have the pieces to fix it depending on what the break is. But they definitely can be fixed.

If it is the cable on the boa you can not re-string it. send them in for new ones

^ that's false. sorry, but working at a hyperlite dealer for 2 years i have repaired, restrung, brought back to life many a hyperlite binding that utilized the BOA. in fact, the repairs became so frequent that my MGR stopped carrying bindings with BOA. but yes, they can be done, and its not real difficult if you have the special BOA tool. tedious yes, hard no.

yes on some boa's but are you sure you can re-do the murrays he is talking about. You can't get behind the heal of the binding to re-thread the boa

jdub is correct