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The reason things like killing jar and silver shrimp fork and bubblin' crude have prices, even though they are not discardable (i.e., can't be autosold) is that they DO have a minimum sale price in the mall which is double the aforementioned price.
killing jar "price" is 88, so the minimum mall price is 176.
Ph'nglui mglw'nafh Cthulhu
R'lyeh wgah-nagl fhtagn.
Somewhere we'll have to handle all the "not what KoL tells us" stuff that the check items commands return!