Another good option for smaller parts is the HF drum tumbler for rocks of whatever it's for. It's a wet tumbler you can use with the stainless pin media. Parts come out sparkly clean.

I stainless tumble, then follow up with corn cob with a nufinish/mineral spirit adder. Overkill, but it's what I use for multiple thousands of pieces of reloading brass per year. Works on pin parts too.

Buy the biggest tumbler you can get and have room for. There will be parts that don't fit a smaller one and you might kick yourself for not going bigger. I say that with four tumblers at home because I learned the hard way.