If you wanna do it cheap, you can plastidip. It's cheap but won't last long.
Painting rims is pretty expensive cz generally it requires a lot of prep work to do it right. (sandblasting / filling / etc)
If chrome rims, it's even more expensive.
IMO It's not worth painting your rims unless they are expensive forged rims like Advan/Volk Racing, BBS, Enkei, OZ, SSR, etc)
Next best option is to get a set of 2nd hand period-correct Japanese aftermarket rims.