This WeakAura requires TradeSkillMaster 4 to operate. This will pull pricing data from TSM's AuctionDB and use the DBMinBuyout price source. In the future I hope to clean up this WeakAura in order to allow for easier configuration, but for now, you'll have to go into each display's aura to modify it.
Idea came from seeing the "Inventory herb/ore mats value" WeakAura here, I decided to add pricing for each herb for the hell of it.