I have seen it a few times now "X item has been added to your loot" from what I get from the Alpha, I suppose this means the items are now stocked in dungeon shops. Like with complicated tasks 4 (I think, the rock garden one) you get the Strenght Potion added to your loot, but you are able to upgrade the witch and prepare it before that.
What vague point I may be drifting away from now is: I would like if Bezar's Bizzare Bazar (in the Kingdom Menu) had an openable list where you could see all the items which he/she/it stocks in the shops.
From what I understand certain boss dropped items can't be bought, so it would be great if some clarity were added.
(Also, I'm a huge fan of lists of all sorts!)