Wireless USB headset?
 

I have a Plantronics Savi W740 that I love. In our new office, however, we use Activity Based Working, meaning we don't have our own desks, so it's impractical to plug and unplug the desktop base station every day. Plantronics does have a mini USB adapter and charger , but they're $120 between the two.

Is there a wireless headset of comparable quality that costs less than $120? My computer has Bluetooth, so I could use a good Bluetooth headset too.