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Google it..? Lots of places are showing stock. SFRC, Cabela's and so on. This is a cartridge you'd need to be a bit more specific about if you want a better answer.
Remington used to produce 300 Blackout in the UMC name by the "bucket" and prices were decent. We haven't had this offered to us in quite some time. Phil.
The only cheap .300 I ever saw was from WASP Munitions who are in the process of shutting down. I'd just try to find your favorite weight that is sitting as close to $1/EA as you can. You aren't likely to do much better these days.