I've been looking into this all day to try and make a Guild store filterer by string.
only info ive been able to come across is the "ZO_TradingHouse" events ... I believe with more research and testing we can grab all the necessary info to filter the results of the trading house there ...
Ive never made a lua addon before so im just scratching the surface with this though... Id love to help in anyway I can
source of my info is
http://wiki.esoui.com/Raw_globals_dump
*EDIT*
After further research the current api does contain away to grab the info
Code:
GetTradingHouseSearchResultItemInfo(luaindex index)
Returns: textureName icon, string itemName, integer quality, integer stackCount, string sellerName, integer timeRemaining, integer purchasePrice
source is
http://wiki.esoui.com/API#Trading_House