The only katipo I am familiar with is a Yowies figure. You can often find them on eBay (I got mine there a while back).
S&N, Animals of Australia has an Australian red-back spider (widow) but I dont think they have a katipo. As I said, I think the Cadbury Yowie's katipo is the only one. I've ordered all my Yowies from Australians on ebay, if you find one it shouldnt be hard to get.