I haven't found 2 1/2" Kent Elite shells anywhere
https://ammoseek.com/ammo/12-gauge/Kent-shotgun?sl=2%201%2F2

Natchez Shooting Supply is out of the 7/8 oz. and 1 oz. B&P, but keep watching. I purchased a case of the 7/8 oz. from them last fall.

William Larkin Moore's supplier here in Phoenix has been unable to source components and they have had no shells for quite some time

The Fiocchi 7/8 oz. Training Loads are also unavailable. They have a Shooting Dynamics 7/8 oz load but it is 1350 fps

https://sites.google.com/a/damascusknowledge.com/www/home