But... only one of them (W) is a gatcha character, One (SOPMOD II) is a story character and the other (ROON) is a construction project and as such those two are *always* available.
Going to copy and paste the author's explanation from reddit:
Cpl_Ethane said:
Official merchants (AAFES, NEX, MCX) aboard US military installations either pay less or no taxes (same goes for the troops who shop there). I'm imagining that Akashi-shop enjoys similar such benefits. I could be wrong, though, and hopefully someone will correct me here.