I can tell you exactly what it cost for me. I took the helicopter from Gorakshep, the highest/last town on the EBC trek, to Lukla, the crazy airport people call the most dangerous one in the world. For me, a 255 lbs / 115kg guy, 2 Nepalis that are each half my size, a pilot, and our not-that-heavy hiking gear was 2000 USD in October of 2024.
Having something scheduled is cheaper than on-demand, too. You may even end up using the same equipment, but at a lower priority (it costs $200 or so to have an ambulance sit at your event, for example).
Pics/video: https://www.instagram.com/p/DBTpLGtydZW/