I think right now you're going to have an even harder time than normal finding a Russian 91%. As far as I can tell, from my emails with Vapor DNA, Kebo is transitioning to producing an updated V2 of the R91. I'd assume all V1 stock has been sold out for weeks, waiting for replacement V2s.
VaporDNA claims they will be the first vendor to receive the V2, but the entire batch was sold at pre-order (actually oversold in pre-order, as Kebo is shipping them less than they had originally requested). They are supposed to land later this week (If my memory serves me, they said Thursday), and ship out to those who were early enough on the pre-order list to receive them.
I was #6 on the list, so it looks like I'll be getting mine, but in the short-term, it appears that the availability is going to remain scarce.