Just a quick and easy bit of gold to help every 3 days!
I can do this on my feral druid, but I think a prot. pala, lock or shadow priest, DK (and other classes to) would be able to do this!
The idea is to solo Onyixa. She drops roughly 50g-55g and a few epics (which you can either DE, or sell for another 15g).
A ran takes about 15 minutes with my feral druid in 3 savage and 2 hateful (just to give you an idea of the gear). Having IMP. Leader of the Pack is very very useful.
Get into a raid (invite a friend and convert to raid) and enter her lair!
As a feral druid here are the tactics.
Phase 1. Run in after killing start mobs (easy)
Go cat, get 5 pt combo, Savage Roar, get 5 pt combo, Rip (Rake whenever it is possible). Go out and cast Regrowth and Rejuv when your at 60-70%. Use Barskin as soon as it off CD
Phase 2. As she is running for the air try to get a good Rip + Rake on and switch to Bear and use Swipe to kill the whelps (+Frenz Reg, if your struggling). Continue to run after Onyixa and dps/rip her down. A few more whelps will come. Continue to help at 60-70% with Regrowth + Rejuv. Soon you'll reach Phase 3.
Phase 3. Same as Phase 1, just dps her down (killing any extra whelps that might carry over from Phase 2).
Now Loot!
The nice thing is the bag she drops are good for extra bank bags. Sell off the epics and you may get a few BOE Blues that you can put on AH (I managed to get a dagger and sold it for 20g). Not insane amounts of gold, but useful little boost!
Another idea would be get lowbies (60 alts or something) to join and get them to pay for the boost (with the new bind items, it would be very easy to make yourself master looter and sell them off).