Here is an old buffer, my dad made this one years ago, he used a washing machine motor which is about 1735 RPMs.
Here are some different views of my most recent buffer that I made.
The motor is about 1735 RPMs and the step down spindles allow me to adjust the speed even lower.
The buffer assembly came from Grizzly Tools, about $130 with shipping. The motor is a Craftsman that I picked up at an estate sale for $5 or $10.
I also have a 1 HP Jet buffer that is 1735 RPMs. I don't think there made anymore but I think it was around $250 when it was new. I have had it for about 10 years now.
I had a Harbor Freight buffer but it was 3500 RPM and was way too fast for my purposes.
My Grizzly knife grinder has a buffer on one end which does come in quite handy. Check Grizzly for current price, I've had this for years and I think the price is about doubled on the machine from when I bought mine.
Normally I keep a ScotchBrite wheel on it to debur and knock the rust off of old metal objects.