Has anyone had luck with any of the members on ebay selling cold hardy barrel cactus?
They will in the greenhouse till the spring then out in the cactus garden they will go.
Why not just buy from a reputable nursery, such as Mesa Gardens, rather that shopping from Ebay?
You've got a neighbour here (chadec) who's got a wonderful garden going. You might email him and ask for some leads, but the Ebay path is too often fraught with disappointment, whereas when you deal with someone reputable, that's clustered with happiness.