Added one and removed one item from the OP in this thread, as the AH issue was fixed up about an hour ago.
Due to an unforseen issue with the item-level squish, some commodities in the Auction House (e.g. some profession materials) aren’t purchasable. We’ve got the issue identified and a fix on the way in the next day or so.- We’re aware of and working on a fix for a bug where applying a Faction Change to a character can result in broken transmog.