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The Undermine Journal Addon
We at The Undermine Journal have partnered with our gnomish engineer brethren to produce an "addon" to bring market information direct to your everyday activities in Azeroth.

When you see any item tooltip, The Undermine Journal will display market data about that item in a box underneath the tooltip.

Once this "addon" device is installed, you'll need to update its information periodically from this site. Simply download and install a new copy for the latest data.

Realm Edition
To get information specific to your realm, including the latest market price, the item's reagent price (cost of production), the available quantity and the date when last seen, please log in using the form below.

Once you log in, you can choose the realms on which you play, and download your personal copy of the addon.
General Edition
If you prefer not to log in, and would like only the US average market price, average and standard deviation, you can find our General Edition on WoWInterface or Curse.

The General Edition version is updated about once each week.
Warnings and Disclaimers
This is very untested software. Those gnomish engineers are also quite untested. This addon may not work for you, it may be glitchy, it may have errors. It may be poorly written with no Lua style or finesse whatsoever. Be warned. If you don't like it for any reason, you may stop using it. Discontinue use if rash develops. Keep away from pregnant worgen.

If a tooltip doesn't show market data, and you're almost positive that it should, click the item again. Your positive thoughts may be all the encouragement that extra tooltip needs.
Thanks to Tekkub for being awesome and for a tiny bit of tooltip code from Engravings.

Thanks to Matt Richard (Tem) and Ken Allan for LibExtraTip and associated libraries.

Thanks to Neikos for (obvious) inspiration in the conception and design of this addon.
Version History
The Undermine Journal uses names and images from World of Warcraft, and data proprietary to Blizzard Entertainment, Inc.
World of Warcraft, Warcraft and Blizzard Entertainment are trademarks or registered trademarks of Blizzard Entertainment, Inc. in the U.S. and/or other countries.