If you send your release into scott they will repair or send you replacement parts. Whenever i have need something from them it has always been free of charge. Great company.
I am pretty partal to carter for thumb releases. Scott carter and stan are great release companies. I also prefer single jaw or hook releases. You might have a hard time finding a local store that carries the a selection of the higher end releases in store. Like rsmith mentioned look on archerytalk for deals. I have never had a problem with any used archery gear. I have used lens, scopes, releases, rests, sights, bars, and a number of bows. With how fast archery gear depreciates due to almost yearly model changes buying slightly used saves you a ton of money.