How does the Tech merchants abilities work?
I know the "correct" answer is probably ask arbitrator but what is the general consensus on how it works.
Do you have to roll for availability of items before you can choose what to lower with technobaubles or friends of the trade? Example, can you just pick grenade launchers for both and that becomes common since would lower rarity below 7+ and 10-30 credits cheaper or would you first need to roll 8+ to be able to choose grenade launcher?
or do you have to pick first then roll and potentially not be able to still get it, like choose a rarity 12 to lower to 10 but only get a 9 are those discounts just lost this visit?
Also if you purchase a hanger on with abilities that affect the trading post, like tech merchant, do you have to wait til next visit to be able to use them?