The shop that you bought them from should give you a discounted mount as a purchase/service perk. If not, count on $30-$60 for a certified shop to do the work. Those "system bindings" can be mounted at home but adjustment and torque testing should be done by a qualified ski tech. Remember, the bulk of the charge for binding mounting is for the time it takes for adjustment, testing, and cost of the overhead (tools,mounting jigs, etc...). Not just the time it takes to drill the holes or "attach" the system binding.