I was already prepared for this, now would be a good time to sell if you have a few extra AR-15/AK47/74 around, make double what you paid, LGS is just selling consignment AR/AK's for $2000 people bring in lol, people have been paying $1800-$2700 for them at LGS lol.
Only walmart ammo I can find is 30-08/274? odd caliber hunting rifles, 7.62x39, 40 S&W, 12, 410, 20g, 380 auto, 22short/wmr/magnum.
SHTF vs TEOTWAWKI you ask? SHTF, just some crap on the ceiling and walls, TEOTWAWKI end of the world as we know it. Orignally made by 9mm/®™©