NYC A Cappella has been arranging for high school, collegiate and semi-professional a cappella groups for over a decade. Though officially formed in September 2006, founder Randi Stanley (that's me) has been arranging since high school and has arranged for all-female, co-ed and all-male groups.
I have produced and judged for Varsity Vocals, host of the International Championship of High School and Collegiate A Cappella, currently review CDs for the Recorded A Cappella Review Board (RARB), am a judge for the Contemporary A Cappella Recording Awards (CARAs), and sing with the semi-professional group, The Sirens, here in NYC.
I have lots of existing arrangements for sale as well with pricing at $50 an under. Re-voicing to fit your group (i.e. co-ed arrangement converted to female, etc) costs an extra $30.