A1: If you're talking about getting the AS-KRI and the Grand Pinger, first you must have a save on your HDD from the original AOT game.

Secondly, there is a glitch (XBOX 360 version) where even if you have the save, the bonus weapons will remain locked. If you run the AOT:TDF game update, it should enable the weapons providing that you do have a save from the original AOT game. The AS-KRI runs about $300K and the Grand Pinger costs around $450K.

All of the other weapons are available for purchase, and you should have no problems getting them.