lol you can try your luck at scrolling. it might be cheaper. not all 30%s are created equal. Spears and pole arm 30%s are easier to pass than gfa, shield int, earring, and claws to name a few. Why this is the case I don't know. Take it with a grain of salt if you don't believe me.
haha i never set up a merchant in my time here at royals also my luck is garbage and I've never gached a sky ski.
My luck is worse, I bombed like around 10+ skis which already cost me like around 2b ... Still didn't get one decent skis yet