Depending on the manufacturer, quality, and / or grade of the lock, you will be spending $15.00 to $225.00 per lock. We could provide that lock or you could go to a hardware store.Replace will be $20.00 per door; replacing front door handle sets are about $20.00 more.keep the hardware, we could re-key or re-pin the lock(s) providing you a new key rendering the old key to re-cycling. per cylinder is $12.00 each.