Do it your self, it won't be any cheaper then buying one already done but the enjoyment in hunting down the parts and the overall experience is fun. And you will be much prouder of your restored pump knowing that you did the work your self. I have restored 7 pumps, 6 for me and 1 for a friend. I have had most of my paint work done by a body man, but I did all the tare down and assembly and hunting down of the pumps and parts. And when you do them yourself you are in control of all the little details.
I say buy a unrestored pump and tackle the project you will enjoy it.
