When you are pricing, be sure you compare apples to apples. Specify the paint you want used, how many coats after the primer. Ask what they are going to do to prep the bottom before primer and what type of primer. The price should include removing it off the trailer, blocking and putting back on trailer. Or lifting in and out of the water. The first job is the most important. If it is not done correctly you will struggle with it until it gets stripped down and done properly. I prefer to have my running gear, which includes prop, rudder and trim tab metal, coated with cold galvanized paint rather than bottom paint. Pettit makes a spray version called barnacle barrier. It isn't cheap, but it works well.