If you are willing to wait for one to come up, and search through a bunch of random crap on Ebay, you might score a used one for $15. Since retail for a name brand version (Cherry Burrell, Tri-Clover, Waukesha, etc.) of this fitting is > $100, $25 is a pretty reasonable price for a new Chinese one.
For all things tri-clamp- Checking St. Pats for the general price range, then KLG Stainless on Ebay to see if he currently has one, is a good strategy. KLG is usually a few bucks cheaper, but his inventory fluctuates wildly. I think he may have one available, but you may need to email him.