On Gunbroker, I'm seeing several 5.45x39 options available for well under $1,500. I have a VEPR and if I thought I could get that much for mine, I'd sell it, for $600, no deal.
5.45x39 ammo is available in quantity at lots of places, this is where I usually buy mine from:
https://www.sgammo.com/catalog/rifle...le/545x39-ammo