For the Horde --- http://wow.allakhazam.com/db/mob.html?wmob=18991&locale=enUS;source=live
For the Alliance---
http://wow.allakhazam.com/db/mob.html?wmob=18990&locale=enUS;source=live
They sell the items to get skill past 300 First Aid and allow you to advance it to 375 First Aid with the Netherweave and Heavy Netherweave bandages, but before this you must get 330 first aid for Netherweave and 360 for Heavy Netherweave
Hope that helps you