Red Army Standard 7.62x39mm 122gr Full Metal Jacket Ammo - Box of 20 - $5.99, limit 5 boxes, 30 cents per round
https://www.primaryarms.com/century-arms-red-army-standard-762x39-122gr-fmj-ammo-box-of-20?quantity=1&keywords=red army standard
SB Tactical SBA4 Pistol Stabilizing Brace - Black, with buffer tube - $99.99, limit 2
https://www.primaryarms.com/sb-tactical-sba4-pistol-stabilizing-brace-black
Note that their system does not limit "multiple" orders of the same items but the number of items in each order is limited.
https://www.primaryarms.com/century-arms-red-army-standard-762x39-122gr-fmj-ammo-box-of-20?quantity=1&keywords=red army standard
SB Tactical SBA4 Pistol Stabilizing Brace - Black, with buffer tube - $99.99, limit 2
https://www.primaryarms.com/sb-tactical-sba4-pistol-stabilizing-brace-black
Note that their system does not limit "multiple" orders of the same items but the number of items in each order is limited.
