I noticed we don't really have one. I don't want to use the icon that indicates the auction house guild hall room, as that can be misleading.

I have one in mind - it would be the one that's on the tapestries hanging from the auction house. It would be used to visually signify the method of acquisition (especially featured auctions), like the "specials" icon used in-game for supply depot sales.

If anyone wants to make it, go for it. For reference, the banner file is in rsrc >>> world >>> prop >>> outershell >>> storebanners.

Something like this but higher res and betterer.