The range where I shoot has been MUCH busier than ever, and ammunition is a concern. It hasn't become a major problem yet, but it soon will if supplies don't loosen up. For the moment, they do not sell any of the lower-priced, FMJ "plinking" ammo for take-out ... only to shoot at the range. They are still selling the premium JHP self-defense ammo for take-out.
The biggest problem is .22LR. They can't get CCI Mini-Mags, and some of the rental semi-autos won't function with other ammo brands/types.