I'm at $3.75 per pound this season. I think I did 250 this year with average weights of 3.0-5.0 lbs depending on which crop it was.
I don't raise Cornish Crosses, but I raise the Colored Range Broilers (formerly Freedom Rangers):
http://www.jmhatchery.com/
As far as how to sell them, here is the cliff notes:
1) The sale of poultry is not USDA regulated, but rather State by State regulated. Some states 'punt' and don't have their own rules, so they defer to USDA regulations.
2) In general, you must take your birds to an inspected facility to have them processed. Depending on where you live, they may be allowed to be frozen, or only bagged & chilled. Only a processor can freeze birds where I live, you can't freeze them if you receive them only bagged & chilled.
3) Once you get them from your processor, it's generally State regulated how you must store them. Generally, they must be held separate from your domestic food supply in freezers or refrigerators which have been inspected.
4) How you handle the birds at the famer's market is regulated by each individual County in your state. In my county, I can keep them on ice at the market for sale. But, I cannot freeze them myself. In King County, they must be stored with mechanical refrigeration/freezer.
The first step to take is to phone your Extension Agent. They get asked these questions every week and she be current on their knowledge.