At one time they did, I don't know if they still do. Now days you might just be limited to the bulk dry foods they carry. Call and ask, though maybe you don't want to mention ammo. Ask if there's anything you aren't allowed to bring in and put in a can.

You can buy heavy-duty mylar bags and oxygen absorber packets from them to seal stuff up at home. The mylar bags can be heat-sealed with a regular iron, there are directions on the internet.

-Blast, always trying something new.