I believe I had gotten one monster from The Paper Doll (of all places, in the now long gone Crossroads Mall in Boulder, CO) but really wanted my beloved crying monster Sea Boz (not that I knew his name back then). so with the help of my friend Jim K I got in touch with Pony Toy Go Round and voila, here was my monster.
and since I didn't want him to be alone I picked up Keeler from the later episode I saw. which was also really cool to have. Bandai did really great work back then on the Ultra Monsters. these guys are quite durable, since they are over 20 years old now, by my reckoning.
it's too bad these were never available when we were kids. what an untapped money bonanza they would have been!