For a cheap fix you could try taking off the grips, and polising the outside with 00 steel wool to remove the surface rust and use some type of cold blueing like Birchwood Caseys. For the bore and cylinders, check your local gun shop for JB compound or you can buy it over the internet. This is a barley paste with fine abrasives in it made especially for firearms. Just follow the instructions on the jar.
Hope it helps.
ps: This stuff brings the accuracy back to your old rifle barrels too as it removes those small build-up of copper that just dont seem to want to come out with the usual cleaning. Just don't get too agressive with it or u can round the lands of the rifling.