Primal Nether in prep of next phase

Hi guys, pvp exclusive player here, looking to assemble mats for the eng epic goggles for when the next phase comes out. What would be the best and quickest way to grab 1 primal nether - taking into consideration that I am not revered with any factions for Heroic content? The closest one is Cen. exp. with halfway to revered.Thanks for your help