I've been trying to do quests for at least the last week, but I haven't been able to do anything because no matter what I do, every time I try to buy from a user shop, I'm told the item doesn't exist.

Mind you, this is via shop searching via the buttons given to me on the quest page, as well as manually searching using the Shop Search page, and the result is the same every time. I've logged out, cleared my cache, everything, and yet it still happens.

41.0.2272.101 Official Build.