If you have only taken up inscription since Cataclysm, you may be missing two glyph 'techniques' : Mana Sheild and Lash of Pain.
They are purchased as a BOE 'technique' from Larana Drome in Dalaran. They are not quite what I would call 'must have' glyphs from a sales perspective, but they are at least profitable.
These glyphs are sold in "limited quantities", if you call 4+ technique's on a 15 minute respawn timer limited.
If you are a scribe, you should probably get these. Even if you are not a scribe, and are passing through Dalaran, it would be worth stopping in at the scribe's satchel - facing away from the magus commerce exchange in dalaran, to purchase a few techniques to put on the AH.
[TSM2] Smelting Mastery Guide - Moved from premium, enjoy! This will be the fourth installment of my Mastery Guides series. Make sure to check my signature for a full list of guides! S...
4 hours ago