Don't get your hopes up. I stopped at Liberty Tool and Fairfield Antiques and found nothing to buy. Stuff was priced at tourist levels, e.g. too high for this traveler. I did linger awhile in Fairfield over an $18 Plomb breaker bar, but passed on it.
I finally found the little Stix-On in a favorite well-organized jumble shop. The Stix-On is noteworthy because it has the bad patent date (Aug. 20 '18) stamped on it.
I found the 12-inch Basford Gripso-Matic in an antique shop we visited 4 years ago. Push both buttons down to release the Gripso-Matic wrench's jaw. The later patented wrench connected the two buttons with a U-shape strap, which made it easier to release the jaw (by pushing down on the top of the U).