He usually has a vending table at conferences and I bet if you email him, he'd help you out. But I went looking and
www.clownantics.com has several differents sets, from farm set, zoo set, mine has 7 which include frog, duck, donkey, mouse, roster, dog, elephant. which is a little different from what they have, but hay get several set and mix and match or the zoo group would be a great circus theme.