Around here, just in the local ads, a DP or layer POL hen will run anywhere from $10-$15, depending upon the breed. No chicken auctions here locally, so no way to compare.
Some delusional folks will try to get $5-$10 from a rooster now and again, but I doubt if they get that money....roosters are pretty much a give away item, especially right about now when they are gaining maturity and causing problems and folks don't want to winter them over.
It's just the newer backyarder with a few chickens that try to get a price out of roosters...those who have raised chickens for some time will offer them for free as few have any intention of killing and eating them. Most folks don't realize a rooster is tender as a baby chicken once canned into a jar.