GN
GN Netcom 2000 corded telephone headset on Ebay is brand new. It is listed at a very low price. Shipping cost for this item is also very low.
The new GN Netcom 2000 corded telephone headset features superior durability and lightweight comfort. It's a 3 in 1 model where user can pick lightweight headband, adjustable flex loop and sure fit ear hook.
Amplifier is required for operation and is sold separately.
GN Netcom 9120 wireless telephone headset on Ebay is used but seems
like in good condition.
It is listed at a very low price. It comes with base, adaptor, headband, ear loop, ear cushion and manuals. The used GN Netcom 9120 wireless telephone headset features mobility, efficiency and more.
This item can be used 300 ft away from user's
desk and frees your hands for multitasking. It also features multi
layer security that gives peace of mind. 
There are quite a few selections of telephone headsets on Ebay.Some are new and some are used. GN Netcom, Panasonic and Motorola are among many brands of headsets listed on Ebay.
Some of these headsets are even shipped out without charge. Sometimes they also come in a complete set that includes charger.It's even more convenient nowadays telephone headset chargers are available in many types such as car charger, wall charger or USB charger.
Some headsets may not work with certain telephones. Some chargers may not work with certain headsets.It's better to get the same brand of telephone headset and headset charger just in case.