Bind Cube is actually your best bet at getting good avatars without dishing out ridiculous amounts of gold.
Go to the trade channel and buy cheap junk avatars for like 200k each. Bind 5, get one advance avatar of choice.
Costs anywhere from 1 to 1.5 mil, which is like a little under expect to pay for a good adv avatar on the auction, except if you're using bind cubes you don't have to mix and match and wait.