Okay, I'm going for the Erebus Moon, but I need several pricey formulas to get that far. Should I save up to buy them, or start opening Alchemist's cases? I haven't even seen an Ectoplasm formula on the MP for awhile now...confused
I suggest you give it time, those are most likely in some way connected to the higher levels of the Inizio Quest chains and so they have been claimed by Constipated Trillionaire and those working on the wings with him.
well you can craft cases yourself and collect to open them at once since its look like you have better chance getting your formula like that.
Its not so hard and even is little cheaper than making caches since you dont use so many fishes and zomg items in it ^^
and since there are different paths to make them you can separate the trash and flowers
for example you may collect flowers and trash for caches and bugs for cases so every 4-8 caches you will be able to make one case without puting much
and you dont really need so many formulas not as many as ingredients you need so the rate of 1/8 is kind of good ^^