I tend to just send what I don't want to keep and can't sell, and expect that I will not get a lot for them. The 2 month olds (4 pounds each) went for 8, and the 9 month old sold for 21.
I am rather close (25 miles) so for me to get a 30 dollar check for 4 birds that I don't have to feed is worth it.
I was trying to sell the 9 month old as a breeder (Nice bird) and no one wanted to pay more then 10.
Which auction did you take them to? We haven't brought anything to auction this year so far, but we usually take birds to kings.