Wishing you great luck, I thought about doing store eggs also but no one up here sells fertile eggs. I got strange looks when I asked about them.
If you can get to the farmer's market in Crescent City (and Whole Foods in some other places) the Alexandre Kids sell fertile eggs. Their flock is mixed--BAs, NHs, and RIRs. http://www.ecodairyfarms.com/Eggs.html