start asking around, you will find someone. call your count extension office, or the 4-H office, or the ag agent, feed mills you will find someone. if nothing else hang a flyer at the feed mill and maybe another home grower would want to work with you on a processing day to get both your birds done.
I have one place near me that does chickens for the public. Its an amish owned free range poultry farm. you just make a processing appointment and drop the birds in the morning. you can pick them up fresh that day later or go the next day and get the all vacuum sealed and frozen. prices range from $2-$3 depending on how many you bring and how you want them returned. I would do my own if I had the gear, but at $2 a bird I could never pay for the gear. Maybe I could set up a chicken processing trailer to rent out with cones, a scalder and a plucker?? Nah that is too much like work.
this year I am going to raise some straight run DP birds and take them in when they get to young fryer size. I am guessing around 16-20 weeks. we like a smaller bird than the typical cornish cross you get at the market so I am going to try this.
Jerry