Tech Unlocks

If you mean the shop, set the item's shopvalue to -1

Basically I am trying to attach the new armor types to only be sold when a specific building is built, thereby controlling where you can buy certain types.  This prevents over-flooding of one cities shop.  Do you just add the specific items to a building and then it won't generally become available until it is built, is it that easy?

Yeah that works too, just remove the tech prereq.

OK, that makes sense, just a little tired, Electrical Engineering is murdering my sleep at the moment.