If you own a compressor, you can buy a good quality spray gun or two, painting supplies, various sandpapers, etc. and probably have money left over. Cost of paint has gone up considerably over the years, but most of the really high prices are for paints and colors that didn't exist when these bikes were built. Acrylic enamel or lacquer starts (in the USA) at around $100/gallon and goes up depending on tint, metalflake, etc. Lacquer is extremely easy to learn to spray and mistakes are very easy to correct. With patience and a bit of practice, you can get the same results with a spray can. A can loaded with automotive enamel, reducer, hardener and ready to spray costs about $25 here in Boise.