Bradis carries it.
CTD has it at about $0.22 per round. They usually delivered to me within 4-5 days
AMM-653 - Ammo 7.62x54R Romanian FMJBT 149 Grain 440 Round Can Surplus Light Ball Corrosive
Also, here is a great tool.
AmmoEngine: 7.62x54mm / 7.62x54mmR, Instock For Sale Premium & Discount Ammunition, Ammo Deals
... reload...
For the price and availability of components, do you find it worth the trouble? Or is it just an enjoyable hobby for you, regardless of cost?