For the unlimited C-Bills option, you need to buy at least one item BEFORE you toggle the option, then toggle it, then buy again. If it still doesnt work, then you leave the store, come back into it, and buy something again. If THAT doesnt work, you got me... lol.
Btw, any of you smart people know of a way to stop my pilots health from dropping? It seems that I keep getting *constantly* head shot, and while I have millions in armor and structure, I still lose from the friggin head shots.
My pilots come back uninjured so long as I check Mechs after one of them is hit.
Use the option for Mega Armor HP or Mega System HP, it shows on the mech (bottom right) in WHITE the areas that are weaker - after mousing over ALL areas it will update with the new higher values then turn those trainer options off once done. The chance to hit the pilot with all that armor should be vastly reduced.