Just in case anyone would like to get some, I saw this group of B. albimarginata on AquaBid a little while ago. This seller is the same fellow I got mine from and my B.simplex as well. He's a local aquarium society member and a fantastic breeder of many, many different fish. I've bought quite a few fish from him in the past and hope he keeps bringing them to the meetings because I will probably bid on them too. Don't hesitate to buy them if you are in the US.
http/www.aquabid.com/cgi-bin/auction/auction.cgi?fwbettas&1270397347
http/www.aquabid.com/cgi-bin/auction/auction.cgi?fwbettas&1270397347