I do mastertrack commissions. Prices will depend on how much time it takes me, usually range from 100-200 sapphires but can be cheaper for simpler tracks (or more for especially complex ones).
I am currently open to doing holiday commissions - there are two examples in my shop (@thedragonlynx): "A Holiday Duet" (Carol of the Bells) and "Cool Holiday Jam" (Jingle Bells) both completed within the past few days. Most of the other tracks in my shop are a bit older and sometimes simpler, and the prices reflect that. I can do some pop songs/other songs, but it will depend on the song, and prices might vary.
Depending on my class schedule and the requested track, I can finish a commission anywhere from 1 day to 1 week after the request.