In my experience it's a bit of a crapshoot.
Especially in recent years (since Obama took the White House, basically) availability has been the biggest obstacle, rather than price. I don't care what someone promises they'll sell me bullets for if they aren't bullets which actually exist on this plane of reality.
Occasionally I've been desperate enough to place back orders. For example, I recently received 500 Sierra Match Kings in .311. I waited many moons for those.