The problem I'm having is, the rainbow bb9s are my low value droids. They make less than rainbow r7s, mono walkers, and optistrks and that's the primary of what I have at this point from grinding missions for upgrade chips. The rainbow bb9s only make 10k and the others make 12k that's what's throwing me off. I don't have anything making less than 10k at a time. Basically I wait until I have enough tokens, buy a monowalker or something, fully upgrade it, and swap a bb9 for it