The obvious choice would be to see if I can get into contact with Hepsity, except that there must be no-superintelligence rules in the Mall otherwise it would already be eaten by superintelligences so maybe Hepsity isn't allowed any storefronts. There are various Causal Founder Species around but they aren't so good pre-superintelligence that it's overdetermined that I'd want to visit them.
I guess go see if I can find a magic item shop from DnD, that sounds nice and allowed. I'm sure someone has some Tomes of Clear Thought that I can go read (checking the mall rules to make sure 30 INT doesn't get you kicked out). I can pay them in knowledge of ~~how to refine spellsilver with prestidigitation~~.