Commission a Mister Tim song: 

New original composition: $750-$1200 depending on project

New custom vocal arrangement, any song: $350 (includes part-specific rehearsal tracks)
    Client takes care of licensing fee through reputable licensing agent such as Tresona

New rehearsal tracks: $50 per track (usually).  These are high-quality all-vocal tracks, not piano reductions of the score.  I offer a substantial discount for rehearsal tracks purchased with a custom arrangement (see above).

Samples of custom arrangements: