Makita XOP02Z 18V LXT® Brushless 5" / 6" DA Random Orbit Polisher $351 + Prime Shipping $351.2

Been tracking this one for quite a while. This is the lowest price I've seen by almost $100.

Tool only. Ships and Sold by Amazon.

Features

Cordless solution for a variety of polishing applications where mobility is important
Battery operated Dual Action Polisher offers selectable Random Orbit with Forced Rotation or Free Spin Rotation
Dual power mode: High power delivers corded power for correcting & low power delivers extended run-time for polishing applications
Cordless design eliminates the hassle of cord management and accidental marring of delicate surfaces
High Capacity BL Brushless Motor eliminates carbon brushes, enabling the motor to run cooler and more efficiently for longer life; Variable (0-780) RPM and (0-6,800) OPM

$351