IF you're in Phoenix, you should stay abreast of NW Armory in Scottsdale. Literally watched them bring in 7 4x4 pallets of ammo yesterday. Also check with Mo Money Pawn/Guns in Central PHoenix, and Ammo AZ N. Phoenix.

Regarding 32 ammo, I am in the Prescott area places I have seen 32 ammo:

Bills trading post
Sportsman’s warehouse
Prescott valley guns
Desert eagle guns
Bucky O’Neill’s