If you're able to cross mail any non-soulbound item, to the opposite faction.
That will definitely kill a few markets.

I'm making 1.5-2k a week, selling alliance (unlimited supply) pets on the horde auction house.
I spend maybe 5 minutes once a day listing them.
Purchase for 30-50s and sell for 9-16 gold, depending on the pet.
Interestingly enough horde (unlimited supply) pets sell for almost nothing on the alliance side, but alliance pets on the horde side are an amazingly easy source of revenue.