Go to any CAL hub, call maintenance on the radio and tell them you need a new headset. They will gladly bring out a new headset in a box and give it to you. Don't need to write it up in the logbook. IAH, EWR, LAX, and GUM have a pallet full of these. They really do want you to have your own.

After 42 years and several dozen different headsets. I find the Telex 850 NR the most practical, and use it in the Jets and other GA airplanes that I spend 120 hours a month riding around in. There are no batteries to go bad, and you don't feel like your head is in a vice.
YMMV.