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Roth Thermostatic Valve Operators - Sources??

I am looking to break out a single 4 valve manifold into individually controlled zones using Roth Thermostatic Operators (Roth part number 2340055354). That thread can be found here:
http://forum.heatinghelp.com/discussion/152525/adding-thermostatic-valve-operators-to-a-roth-hk-manifold

I have only found one local source for the operators but I'd like to do a little price shopping before pulling the trigger (the local source quoted a Taco ZVC404 at more than double what I was able to acquire one for). Any good, reliable sources out there for Roth operators?

Thanks.

John