Assuming you are talking about 7.62 Nagant for the M1895 revolver. This stuff can be hard to find at times, and gets expensive, because there is only one manufacturer that makes it. Fiocchi will occasionally make a run of it and ship it over here. The NY ammo guy will usually have some at the shows (United Cartridge Co., Congers, NY, 845-267-5074). Your best bet is to make the show at Wilmington on March 1st, and see if anyone has any.
GC