Cheap being the operative word.
You can find .308, it just cost what it cost.
It's not like you can't find it.
We were at the range a few weeks ago, high power line, and watched a guy fire off a shot, look down his spotting scope, reset, breath, fire, and repeat. He did this 20 times, stopped, took off his jacket, and reloaded his bullets right there on the line. He had a strange custom gun (serial number was low 3 digits) designed for the discipline he was shooting. He told us that he doesn't have a choice BUT to reload because his type of AMMO is simply not readily available.