So cute! Yarn and cats, two of my favorite things! They'll be great to hang in your craft room once you get it.
I know having two out of a three-item set would annoy me to no end. This shop (http://www.butlercountrycrafts.com/cart/agora.cgi?&product=margaretsherry&xm=on
) and this one (http://www.maryjanes.com/category_results2.cfm?Category=4&SubCategory=1351
) have the pattern listed and apparently in stock, but I personally haven't used either place so I don't know what their service is like. You might also try searching with the catalog number, MSPO735, if you haven't already. I hope you're able to get the third one somehow, someday!