According to the rules there should be a "list of approved Production Air Pistols
is available on the IHMSA web site or from the evaluation committee." From Section VI.A.19. (pgs.11-12)

I am too dense to find such a list. Any suggestions?

I could be wrong, but I have doubts that it exists anymore. Like everything else: down the tube.
If I am wrong and it does exist, it is most likely woefully out-of-date.

Given the rise in prices, the $375 MSRP becomes ever more restrictive. And the discontinued "good" pistols are scarce and getting pricier all the time.