How much does rust removal cost?

I have a little rust on my car, do you know how much it would cost to have removed and refinished? Is there a product that I could use to do it myself, that works great and is fairly simple? I just want the rust gone so it doesn’t get worse until i get the money to have it finished and repainted. Any advice and experience would be greatly appreciated.

Navel jelly is a good product to use and is very easy to use. Good Luck and GOD Bless