The little compressors at Harbour Freight are pretty cheap,, like $60, and they have some nice little paint guns with the plastic container on top for about $20.  I have used my assorted ones a lot over the years for planes, and motorcycles, hot rods etc.  You don't need a booth if you do it outside and wear a fairly good carbon filtered mask for about $30 to$40.  A nice dry warm day is good.  I haven't used a paint spray can for many many years.