As I pointed out above, you can do a CSA where you get the customers to pre pay for the birds before you even order or hatch the chicks.  You give them a discount over what they would be paying if they waited and build in a set number of weeks they need to come and pick up the birds, or combine it with a vegetable CSA pickup or have them get a certain number at once for their home freezers.  
If you are organic you can double the normal price.  You can also add more if they are free range and more again if they are "heritage" birds rather then the Cornish/Rocks.  You can get the organic feed shipped by the pallet at wholesale prices if you have a tax ID for selling or get it in bulk.  WHolesale will run you about $15/50 lb bag which is comparable to retail regular feed.  You can also supplement with home grown feed and greens and scraps if you are organic at your farm. 
If the birds are taken to processor and frozen and you keep them that way, the Health Dept issues are minimal.  You just need to show them the packaging and the thermometer in the freezer if they ever come around, which they won't unless there is a complaint.