Yeah Kakei...
I charge $70AUS, but usually I can do it to an extreme degree of perfection. I usually do the first 30 seconds, send it to the person to show them the quality of my work thus far, and ask if they'd like me to continue. If they agree, I continue on and discuss payment and once payment is received I send them the whole sheet music.
It will however be a very professionally transcribed, spaced and notated piece of music in PDF or Sibelius format.