I wouldn't pay more than $10-$12 for adult guineas. With that said though lately at auction here they are going for $13 for regular pearl and some this last weekend that were Chocolate went for $18 each. I won't pay that, if you wait until fall gets closer people will sell them even cheaper. Last year we bought 3 month olds for $4 each in Sept. They are now laying and doing a great job at eating all the little bugs coming out. They don't eat anymore than my chickens in the winter and are basically free during the summer months since they free range for most of their food. I do give them some feed at night as a treat to come into the coop. Hubby taught them to come to "here kitty kitty" so that is all I have to holler at night and they come flying in and running in from all directions for their coop. Sprinkle some food in the coop and they are happy little fellows.