Just in time for spring commissioning, Amazon's Deal of the Day is a Dewalt DWP849 rotary buffer for $130
https://www.amazon.com/DEWALT-DWP849-7-Inch-Variable-Polisher/dp/B0052RXM10
https://www.amazon.com/DEWALT-DWP849-7-Inch-Variable-Polisher/dp/B0052RXM10