Ends 6/7 at 10PM PT. Electronics.woot! has the Plantronics CS540 Convertible Wireless DECT Headset for $85 with free shipping for Amazon Prime members or $6 shipping. Includes charging base.
Ends 5/10 at 10PM PT. Best Buy has the Plantronics Backbeat FIT 6100 Over-the-Ear Wireless Bluetooth 5.0 Sport Headphones (Black, 213571-99) on sale for $70 with free shipping.