I just went through that with a '48 2 ton,
Barrel rollers are about as extinct as a Dodo bird.

I have an very good bearing supplier and his search turned up 1 source for current supply. Prices were between $350 and $500 a bearing.

I did find a listing for Chinese new parts but wouldn't chance that.

I searched Ebay, Craigs list etc. and finally found NOS for everything.