Epic refines from sun scrolls, tho advanced can be good too, if you still need a lot of them for ur p1.

Cave keys are still the best thing to get for moon scrolls. There are training pots too, they can be a good choice for a while if you want power fast, but they're kinda overpriced.

Good news is, that infinite illusion drops bells and summon contracts, so you don't have to spend on that junk at all anymore. Also experimental vials are more widely available than they used to be.