Hi guys this is my first post I believe well here it goes, In Winterspring there is a area that I'm sure is familiar to most people who browse these forums the place is called lake kel'therel [spelling could be off]. But for those who do not know where this place is in Winterspring the are if you go to everlook, you just go west for a very short time and you'll come across a frozen lake go on the lake ad you will find many of these http://www.wowhead.com/?npc=7524#00Rzc and one other type of ghost
these are what you want to kill as you can see they drop formula:icy enchant the website says 2.5% chance but from my experience i believe its much higher in 3 days of botting there i got 36 formulas and a few other good enchanting formulas as well these also drop very good cloth and money don't hit for a lot and have very low HP so good luck guys I hope this helped .
EDIT: i forgot to apologize for the lack of coords i am unable to log on right now and check and I also cant seem to find it on WoWhead sorry for the inconvenience guys