How much does this cost to the nearest dollar?

Siemens Standby Power Mechanical Interlock for use on and Murray Meter Combinations
Siemens standby power mechanical interlock kits provide a means to ensure that the Main breaker powered by utility power within a panel is forced to the OFF position when standby power is in use. It also ensures that the standby source is forced to the OFF position when the utility power is in use. The most common application for these kits is when a portable generator is used to provide back up power to a building. If the utility Main breaker in a panel is left in the - ON -position while a generator is powering the panel, dangerous back feeding of the utility power lines can occur. The will work on Siemens and Murray 200 Amp, 8 space, meter combinations with the main breaker configuration as shown in the images

Price is $761.00

Price: $761.26