Toxicadam wrote: You can only buy more boosts when you completely run out. It should give you an icon that will tell you the ISO cost of each one to buy 3 more of them. The costs are cheap. It's 200 ISO to buy a set of three +3 AP all, and 100 ISO to buy a set of three +3 Gr/Bl or +3 Red/Yel .. etc etc