I have had luck selling them on Craigs List with a picture, and these were all hand raised and hand tame and 4- 5 months old. I have sold them for $10-15, they were all purebred, I found nice homes and flocks for 6 roosters so far.
One person lost their rooster to a hawk who was defending his hens. Another rooster went to someone who thinks that a cougar got her rooster as her dog refused to go out that night when they heard something by the chickens and she saw a big flash of yellow.
Also people that have a rooster that has developed a mean streak are looking for replacement roosters that are tame and will not attack when their back is turned.
If they are gentle and tame and come for goodies then roosters can be placed. With any extra very young roosters if I know that I don't need them then I take them to the local weekly auction, and you can get at least 3.00 for started chicks, 6 week olds or so.
Also take a picture and print out flyers and post at feed stores.