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At a rental equipment store if you live around any town of any size.
These machines move about from side to side by your slightly tilting the handle, so they like "walk". I had to use one of these years ago (30 years ago) to sand out the entire concrete slab of underground parking to a high rise complex on Siesta key in Florida, when I was a laborer, back then.
Well, that same type equipment can be used for sanding floors. I was quite impressed at the job the 18 year old son of the historical building's owner did. It was a lot of work as you have to keep changing paper, vacuuming, downsizing to finer and finer grit paper, etc. But it came out really nice looking.
And the professional who has years of drum sanding experience leaves ridge marks in the floors that can be seen when you look towards windows where you pick up the reflection on the floor, and gloss clear coat is used. (Maybe it is the antique sander he has?, that his 85 year old dad used to use before he died) That is why if you DON'T get a perfect job and get tired of futzing and futzing, use satin instead.
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