As of this morning, we are no longer selling the QUEST and OUTFIT packs.
It did not make any sense to continue selling them as individual DLCs after Black GOAT had come out. We initially were selling them alongside Black GOAT for customers who might only want those specific DLCs bundled together, but the amount of copies sold were very little. So, in an effort to cut down on our number of products (specifically DLC since we do know that we have a lot and some people may be put off by that), we asked Valve to retire those two products.
This does not impact anyone who already has them in their library.