Hardware recommendations for 2.5mm headphones

Hi people,

Just wanted to get a recommendation.

I’m looking to buy several wired headsets for sales calling boots that work with Polycom SoundPoint IP331, therefore 2.5mm

Looking for a cheap, though headset.

I have many RJ9 headsets but the “converter” costs almost as much as the headsets themselves !!

Thanks!

Probably the cheapest way is to look for an XBOX headset with microphone.