Well if you want to coat just a small part then it's an expensive way to go. Some coaters use an automated system and you'll wait until theres hook space and they are shooting the same color because breaking down an automated line for color changes and unique or small parts would just be too much labor and time consuming. Batch shops can handle the part most efficiently but most will still charge a basic price to set up the color and bake the part. So a single or small piece will be expensive. I can't believe I'm saying this but...... maybe a guy doing it as a hobbie is your best bet. Check out they're work first to be sure they know what they're doing. Keep in mind you WILL get what yo pay for