Surprise! No guts. Now what? The guts in my door are broken, hence why I decided to replace the lock. Where do I buy compatib guts for this handleset?

The lock body is included in the purchase of the door. The QuickFit handle is intended only for Signature, Tradewinds, and Platinum storm doors, which the lock body is included when you purchase those door models. If you need a new lock body, you'll need to ask a store associate to place the order for you.