This Mote of Mana farming guide will show you the places that I use for farming Mote of Mana. There were no major changes to Mote drop rates at Outland, so this guide can be used for Burning Crusade Classic (TBC) and Retail WoW.
Primal Mana comes from combining 10 Mote of Mana, so if you need Primal Mana, you have to farm Mote of Mana.
Mote of Mana
Killing Mana Wraiths above Area 52 is also a good farming spot.
You can also kill Warp Monstrositys along the red line marked on the map. These mobs are a lot more spread than the previous mobs, but it's a good alternative farming place if you can't farm at the previous two places.