I would wait till spring to buy one, you living in Cave Creek and all. But, if you have a real bright and sunny window, you could just keep it inside in the window for the winter, and buy it now.
Rangoon Creeper is a bit of a slow starter. The first year it sulks, the second year it will grow about 8 feet, and then after that look out. All hell breaks loose. It will eat up and arbor till you don't even know where the hole in the arbor to walk through is...lol! Actually if I just kept on top of it, which I don't, it wouldn't be too hard to maintain and keep formed. But every time I want to cut it back, it's in bloom, and I hate cutting off all the pretty blooms.
Alan