Found a website for a shop out of Tucson AZ selling crates of 5.45 x 39 surplus Russian, 1980, production for $238 per crate of 2160 rounds (ie 2 cans) I have not found a better price anywhere.
The shipping to me here in Denver was $32 (UPS Ground) which seemed reasonable as well, instead of jacked up to pad the margin.
I'll post shipping info once I get confirmation it's on it's way. That's how I judge an online shop. UPS is UPS and ground transport takes as long as it takes, (until someone comes up with a decent matter transporter) but if it takes more than a day to pull and ship an order for one crate of ammo...
In any case, if this is a round you shoot, I have yet to come across a better price per round.
U.S. Armory Corps- Ammo Surplus, Weapons, 5.45X39, Barrels, Lower Receiver, Ammunition