Click on one of my two pictures from above and it'll take you to the database entry for Gymnocalycium mihanovichii. When you get there, there's a link under "From our plant lists" that says "3 members have this plant." Click on that link and it'll bring up the names of the folks on ATP that have it in their plant list. I'm one, but there's also bendee31 and treehuger. Now I don't know if they have var. friedrichii, they may just have a 'Moon cactus' (which also goes by Gymnocalycium mihanovichii if I'm not mistaken). You could always try asking them if they know of a good place to purchase Gymnocalycium mihanovichii var. friedrichii if they don't have one.
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