Vossner,
Here is a list of nurseries, many mail order, that carry Hot Cocoa:
http://www.helpmefind.com/gard...
You may get the plant as a rooted cutting instead of a grafted rose, but sometimes I find those better, as they spread by there roots. Of the nurseries listed, I've always been very pleased with High Country Gardens, and it appears they have it in stock.
Hope this helps!
Alan