Hello

The averages for monthly pricing on the ATR 72-200s range from $50000-110000. USD per month; the ATR 72-500s from $80000-165000. per month, and the Dash 8 Q400s from $90000-175000. per month.  All these figures are based on the a/c age (and its corresponding worth).  Hope this helps.  Let us know if you needing any help acquiring them.