https://www.mouser.com/ProductDetail/CUI-Devices/SJ2-35853B-SMT-TR?qs=DXv0QSHKF4xcEQUTnRYIcA%3D%3D
here is a link to a headphone jack, which costs 47 cents each if you get 5k. they already have the added electronics to be able to send audio over usb-c, so it is pretty much just the cost of the jack itself at 47 cents.
https://www.mouser.com/ProductDetail/CUI-Devices/SJ2-35853B-SMT-TR?qs=DXv0QSHKF4xcEQUTnRYIcA%3D%3D
here is a link to a headphone jack, which costs 47 cents each if you get 5k. they already have the added electronics to be able to send audio over usb-c, so it is pretty much just the cost of the jack itself at 47 cents.