in the latest public patch (14) I have found that you are able to buy more than one from everything from 'blank slate' to 'copy x' (and also prismatic eggplant) even though they don't have the multi symbol. I did this by clicking to buy it but before I click to activate it on a character, I right click and bring up the shop again and I'm able to buy another. This is fine in it's own right but when doing this with the prismatic apple and prismatic eggplant the option of the different palette or dick shape pops up and once I choose it the stack of that item stays on my hand until I buy something else/ select another item to use, the others work fine thou. also when going to select the item i have meationed you have to but it again