I won't make this to be one of those long and explanatory posts, this time around i will get down to give you the information about a few potions that turned out to be a real small gold mine.
First of all, these potions that i have been selling them for a long time and made some good profits from are basically catering to the twinks that are hard into PvP.
First potion that has been a great success for me has been the Free Action Potion. These little potions are the sheer awesomeness of being the unstoppable force for the next 6 seconds, meaning you can't get stunned or have your speed impaired. One other thing you should know about this potion is that if you decide to go for it and sell it you are going after a bigger twink market, meaning this potion is good for it's money up to level 80, but sadly above 80 it's simply not working.
Another tip i could give you is that it would be a good idea to try and sell these by making some kind of a catchy macro to advertise. If you are looking for an example try /2 You love playing PvP, love carrying that flag but those interrupts and stuns bringing you down? Well buy a Free Auction Potion and put a stop to it now. On the AH now ! (you could mention that it's only viable till level 80 but if you want to be a devious goblin leave that out of the macro)
Another two potions that are a good choice is the Lesser Invisibility Potion, and the Invisibility Potion. These two are a good choice for the hard core PvPers that love playing in the low tiers but aren't Rogues. Only drawback with these is that they have a level thresholds where the first one is for level 21-29 twink tier while the second one is for the 31-39 tier. So unlike the Free Action Potion these two are more limiting, so you will need a macro for their sales as well, if you want to make some sales that is.
Reason why i turned back to the Vanilla time items for things to make gold from is a good story, and i will make a post in the upcoming Spotlight series in a few days.
So, like always, keep an eye out for good opportunities out there.