I would especially be interested in the Flame series, seen on http://www.schlumbergera.org
Only reasonable ones I've found so far is http://www.bobsmoleys.com/
I am not sure where to find the Flame series but www.whittongreenhouses.com has many varieties for sale. I have never purchased from them but I have heard good things about the company. You might also check on ebay. I have purchased from a couple of different sellers on there and have had good experiences. Good luck in your search.