On eBay Summit Racing is selling a whole kit with free shipping for $206 and has the Vacuum Shutoff Switch and a Relay.
There Old kit with a different type of Vacuum Pump used to sell for around $265.
The new; Newer Vacuum Pump Kit now costs less than a replacement Pierburg Vacuum Pump.
Right Stuff Detailing EVP01 Vacuum Pump 12 V DC Black Hose Kit | eBay