R.I. Gen. Laws § 16-24-17
No school district shall pay to any provider of either health or educational services to children with disabilities under this title any charges in excess of the rate currently being charged by the provider to any other public or private purchaser for the basic services, including any charges for room and board, nor shall the school district pay any charges in excess of the rate currently being charged by the provider to any other public or private purchaser for any other services deemed necessary by the individual education program. The school districts may request from the provider one hundred twenty (120) days prior to the start of their fiscal year a rate for services to be rendered for the ensuing fiscal year and the providers shall not change the rates during the ensuing fiscal year.
R.I. Gen. Laws § 16-24-17