Radiator Flushing on 1992 Nissan Pickup (D21)

I would like to know how much on avg. does it cost to get the radiator flush

Asked by for the 1992 Nissan Pickup (D21)
To disconnect the top and bottom radiator hose and flush forward and backward refill with fresh coolant and purge air about 1 to 1.2 hours $20 to $25 in coolant, hose clamps and recycle fees.