The eggs sell for $5 a dozen at our Glendale, AZ farmer's market too - even last summer when the hens were laying very well. $5 does seem high for eggs, but some people are willing to pay extra for fresh, healthier eggs and the convenience of buying them at the farmer's market versus making the appt. to pick them up from a private seller. Once our Glendale market opened back up, a couple of buyers that were buying from me, started buying their eggs there - more convenient if they are already there purchasing produce, etc. also. One of those buyers had already insisted on paying me $10 for 2 dozen eggs, just because she was happy to finally find some fresh eggs.
I sell my extra eggs for $3 per dozen (large brown & green eggs) and sometimes don't have enough to fill the demand. One thing I have noticed is that our feed prices are pretty high in this part of the country - $17 for 50 lbs of layena. The high cost of feed means it costs more to produce those eggs. I figure the eggs I sell just help the chickens pay for part of their keep - feed, shavings, oyster shell, & fresh spinach.