Ammo SDUs reset after PT2, cannot purchase those I did not (solved)

After I finished PT2, all the ammo vendors stock of SDU went back to the first SDUs (lowest number of bullets) and can no longer be purchased, since I already purchased those versions. Therefore I can no longer upgrade those types of ammos I did not fully upgrade before finishing PT2. Any known workarounds?

Found the answer: T-Bone Junction’s ammo vendors have max ammo SDUs available after PT2.