Plantronics has announced a price decrease for the M100 Bluetooth headset. Plantronics M100 Headset Plantronics has announced a price decrease for the Plantronics M100 Bluetooth headset. This MSRP price change will take effect March 1st, 2011. The current MSRP for the Plantronics M100 is $79.99. The new MSRP will be $69.99. Product summary: The Plantronics M100 headset sounds natural, feels natural and is the perfect companion … Continued