According to Education Week, CC aligned tests provided by PARCC cost NY Districts $29.50 per student. PARCC is the consortium that provides assessments for NYS schools. The other consortium is Smarter Balance which test costs $22.50 per student. Local assessment typically cost $12.5o per student, I believe.
Goergia, Oklahoma, Indiana and Florida, among others, have withdrawn from the PARCC consortium and are in the process of developing local assessments partly due to cost.