Aimsurplus has been selling 7.63 X54R for $11.50 for a box of 20 loaded PRVI ammunition. I bought 10 boxes from them awhile back. I see they are out of stock also now. However, its worth watching their site for a restock. Good ammunition and relaodable brass in addition.

Prvi 7.62x54R 150grn FMJ 20rd Box