AR15 mags: Command Arms 30 round poly mags - $20 - about 30 or so left in stock
Ammo:
.223/5.56 - only varmint loads, >$1/round
Saw some 7.62x39 and 7.62x54 there, didn't catch the prices
9mm - Some single boxes, $20+ per box, no bulk
.38spl - $25/CCI aluminum case (25 or so boxes), $28/Winchester brass case (25 or so boxes), UMC 250rd bulk pack $110 (3 left)
.380Auto - lots of 50rd boxes @ $25 ea, 100rd packs for $50, Blazer Brass 250rd bulk packs for $100 (several dozen)
.40S&W - some 50 rd boxes for $25+ ea, Blazer Brass 250rd bulk packs for $100 (several dozen)
.45Auto - didn't look for singles, Blazer Brass 200rd bulk packs for $100 (10 - 15 left)
Yeah, the prices aren't great, but I can't find .40 .380 anywhere lately for less than these bulk prices.

Sign up says limit of 1 bulk pack or 10 normal boxes per customer. Not sure how heavily enforced. I bought four of the CAA mags, didn't see a sign about quantities on those. Helpful employee at the gun counter spent some time showing me some glass and said they had actually gotten some PMags with the ammo shipment yesterday, those all sold by this morning and were also going for $20 each. This is the first time I have looked at the CAA mags, but they feel like good quality mags, seem VERY comparable to a PMag and are made in Israel so I tend to think they'll work well.
ETA: Almost forgot: no bricks of .22lr, but a few of .22 shorts, several dozen small boxes of .22lr.