Prickly pear also known as "paddle cactus" can grow pretty much anywhere provided you get the right variety. They ship well so if you can't find a
local supplier do a search
online for "frost hardy", frost resistant" or similar terms and you'll find quite a few varieties of opuntia that are hardy in colder zones.
I had a friend in Ohio that grew one in his
yard for almost 20 years in an area that averages 100"+ of snow a year but I don't recall what kind it was. Damn thing was almost 10 foot tall and at least 15 foot wide!
I was going to mention that this didn't belong in the gear section, until duh...that's where I noticed it!
Okay nevermind! I just saw you got some. So much for my short sighted reading span!