E. Orix, if those are gouldians, I paid any where from 50.00 to 80.00 a bird, for the yellow backs. The double factors, red head, white breast, I paid 80.00, and the hens 60.00. Hope this helps.
As good of a breeder as you are, I would say the aforementioned price would be abundantly fair, E Orix. Maybe more, as I bet your birds are well sought after.