This is not an official Tradeskillmaster module, what you see here is based off of the default settings.

TradeSkillMaster_PriceCheck is an addon that leverages TSM auction database to reply to special chat commands to with a price automatically.

 Someone sends a command via chat, whispers, or whichever channel you choose. IE:

Someone whispers: ? [Felslate]

To Someone: Market: [48.0g] Min Buyout: [47.40g] Regional [49.79g] Scanned: 10 Mins Ago

You can also check based on a stack/partial stack. IE:

Someone whispers: ? 42[Felslate]

To Someone: Marketx42: [2016.5g] Min Buyoutx42: [1990.80g] Regional [2091.44g] Scanned: 10 Mins Ago

It checks for a ? at the start of a sentence.  You can change this in the options.  It also checks for ? #, to get the price of a stack/partial stack.

Currently it supports guild chat/say/whispers/bnet whispers/officer/party.

You can choose the channels to reply based on say/guild/officer/party.  Whispers always reply in same, be it over battle.net or in game.

Typing /tsm and going to the Price Checker module options will allow you to access the options for it.