Prices vary wildly around the country. There is no universal "best price." You and your customers would know best what a fair price for your area is.
Before I got chickens, I was paying $7-8 for a dozen certified organic eggs from a local family farm. In my area that is a high price but that farm also had no problem selling out of eggs every week.
Before I got chickens, I was paying $7-8 for a dozen certified organic eggs from a local family farm. In my area that is a high price but that farm also had no problem selling out of eggs every week.