I advertised Sizzles (frizzled and smooth) for $10 each, they were around the same age as your chicks. They were literally snapped up. They were all gone within 3 days of me posting the ad (and I had a bunch of them).
If you have a local sales network like Craigslist, look around to see what others are asking and if the quality of their birds is similar to yours.
Good luck, selling them. I bet they'll go quick, theyre adorable!