So, I noticed that completing certain quests and quest chains earned discounts with the general vendors (maybe others as well?) in various areas. For example: completing Waterworks got you the discount in the Harbor, and the Tangleroot/Splinterskull quests got the discount in House P.
Does anyone know or remember the quests for the other areas? I thought it might be a useful thing to know for folks who aren't in a guild and can't access those vendors in House K. (Some of my toons are in a guild, some aren't, so the resource isn't just for me.)