Currently you can purchase this recipe from Evie Whirlbrew in Everlook (a neutral vendor). The recipe binds when picked up, so you can't sell it or mail it to another toon. It's also not limited supply, so you don't have to worry about camping for it. As long as you can get to Everlook, you can purchase the recipe. She also sells the potion itself in limited supplies, so you could stock up on cheap potions while you're visiting.
The nice part about this is that it was previously a pretty rare recipe. I don't think many of us ever got to exalted with ZG in the first place, much less on an Alchemist. I suspect few players were able to make this potion, now pretty much any Alchemist can get it. Another bonus is that this potion does not have a level limit. It appears that even level 85 characters can use the potion.
I'm not certain if we have a different stun removing consumable that competes with this item, but I didn't see one among the other potions. The closest comparable item is the Free Action Potion. The effects are slightly different since Living Action Potion will actually remove an existing stun and Free Action Potion does not. On the flip side a Free Action Potion will give you immunity for 21 seconds and Living Action Potions only work for 3 seconds.
Both of these potions look like they would be very helpful in PVP situations. If you're a serious PVPer I could see you keeping a handy supply of both. I know for a while I dabbled in Free Action Potions during Wrath as a low volume, high profit consumable. It looks like the current prices on both potions vary pretty widely due to the low availability on most realms.