Actually there is a whole industry doing "debt collection" and they are legit too. One of the thing is to "sell" the debt to them for a discounted rate. They will do what they can to collect the full amount. Either that, they will collect a fee (flat rate or percentage). They will collect the debt legitimately. But I can assure you, they will cause hell for the debtor. Phone calls in the early mornings to every number you are associated with, showing up at your home, work or regular places, etc etc... But all done legally though. At the same time, they will send reports to credit rating networks like experian, and the debtor will end up with terrible credit rating, making it very hard for him get car, house loans, even mobile phone plans and all will start asking him to put a deposit in.
So if TS really go this route... all I can say is good luck Justin. The smart thing for Justin to do now is to either fork up 300 more to pay for the CSC repair, or a full refund, and take back the camera. So Justin, if you are reading this, you better wake up your idea and do the right thing before it is too late.