Your eggs should cost more than store eggs - hands down no question.
Tell your husband that there is a BIG difference between factory eggs (and yes "cage free/free range" eggs from the store are still factory eggs - legally the term doesn't mean what it sounds like, per the FDA) and your backyard eggs.
* Your birds get to go outside, and eat grass/bugs. Factory eggs do not.
* As a result of going outside, your birds get more vitamin D than factory eggs. They will also have higher beneficial Omega levels (3&6) from a natural free range diet (bonus if you add flaxseed, but they will get more than enough from green grasses/plants and bugs).
* Your birds are likely to be fed more calcium (from nature and your lay pellets, and if you supplement with oyster shell). Your eggs will have thicker shells, which helps to keep them fresher.
* You don't wash your eggs in chlorine, as the factory does to remove the poo. Your 'bloom' (egg cuticle that protects the contents by blocking bacteria from entering the shell's pores) is likely intact, and you can safely eat 2-3 month old eggs.
* Your birds will be getting more carotenoids (from nature and their feed), which is what gives them that bright orange yolk.
* Your eggs are FRESH! Crack one of yours in a pan, and crack a store egg next to it. Which egg white ran all over and is a big mess? The factory one will, every time. This is how you can tell the egg is older. As it ages, the white evaporates and becomes thin.
It all depends on your market - if you have other backyard sellers on craigslist and farmers markets, try to price in the same range as them. Don't undercut them too much (it's rude, and benefits no one). Find the most expensive eggs at the grocery (omega "free range") and base your price around them.
Make signs to hang up at the feed store / your work / community bulletin boards / et cetera extolling the virtues of true pastured eggs - and watch the customers start lining up! PM me if you want copies of the adverts we use - we get 5$ a doz for multicolored free range eggs.
Good luck!