GPH: Objective Mammoth Meat!

Every level 80 should know the mammoths near the Sons of Hodir HQ in The Storm Peaks. There are huge profits to be made, I went in on my hunter and farmed them for an hour. I can recommend you wear an average of iLevel 232 for fast and efficient farming. Locations are here and here.

These are the loots after one hour.

Grey junk: 19g
77 x Chunk o' Mammoth: 174g
35 x Chilled Meat : 17g
6 x Green Items( Disenchanted into 29 Infinite Dust and 2 x GCE ) : 75g

That's 285g per hour with the only profession being used Enchanting.

Cooking
- You can combine the chunks with other meats into a Great Feast and sell it like that for 60-100g a stack.
- Chilled Meat can be turned into Northern Stew and can be sold individually at the AH for 1-5g , people buy these for the daily Cooking quests.

Skinning
I'd say one hour would fill your bags with a minimum of 5 stacks of Borean Leather and maybe some Arctic Furs. Expect to sell a stack for a minimum of 5g.

TIP: If you run out of mammoths to kill, you can opt to move a bit to the west and kill Jormungars for Worm Meat or Elementals for SoH relics and eternals.