You want to bring me back to WalMart, stock your dang shelves with ammo. You buy everything else outside of the US. Flood the damn market with cheap ammo. Makes for good target use and it will force the market back into equilibrium.
Ammunition import licenses are controlled by the BATFE on a shipment-by-shipment basis. If they decide not to license imports, there’s nothing Wal-Mart can do about it.