nothing special that I know of.... Only paint I ever bought off the net that came out cheaper then buying locally was a couple gallons of DuPont Chroma Base that nobody else bid on....

IMO, there are a lot of things to consider on paint other then just the cost of the materials.... Most of the farm equipment I've seen has an orange peel condition.... Could be the application, could be the materials used. I guess it depends on what kind of finish you want. I'll never understand someone spending big bucks to build a car, then buying cheap materials for the paint.... If applied right, any quaility paint can give good results, however. The old trusty acrylic enamel will still look good, some of them even have a clear coat available to enhance and protect the paint..... When shopping for paint, the price is based on the results you want, be realistic on your expectations!!!!!