At a dealer you're probably going to pay like $2000+ to get a new SC. You can get one from PSE (I think that's the company) for around $550, and I've heard they have a great reputation, and lifetime warranty. To find out if the coupler is the problem, you can remove the SC belt from the pulley, and turn the SC pulley back and forth with your hand. If it moves more than a 1/4" (a very small amount of play), then you have a bad coupler.