Selling to coworkers is easier then having customers all over the city. Just have him purchase his own Lock&Lock brand of plastic locking-lid egg carton (about $7-$8.00) to bring to you every week for refills. Any other brand will not fit XL eggs and Lock&Lock is the only one large enough. I've bought other locking or snap lid cartons and they smash big eggs. You don't want a lot of customers because hens slow way down or completely stop laying during winter months (even some of the so-called winter layers stop) - it's iffy and you'll get customers constantly bugging you. With a coworker you'll get a better understanding with him/her. Our pet store owner has 40 RIRs and BRs that are excellent layers but he laments in the winter of getting only 3 eggs a week from 40 hens so don't think your summer glut of eggs will continue all year round.