We found (and eventually purchased) a Gary puppet at a Wild Birds Unlimited store. Not sure if those shops exist outside of the Midwest.
I had my family in stiches as I stood in the store, loudly impersonating Gary with his signature "I'm gonna BOP you in the nose!" and "bup-it-da-bup-it-da-bup-it-da-bup-it-da-"s...