Many relays have both Normally Open (NO) and Normally Closed (NC) terminals on them. The relay commonly used for aftermarket fog lights has both terminals. Hella, Bosch and others make them, and they are available at most auto parts stores. They usually have terminal numbers 30, 85, 86, 87 and 87a on them, and many have circuit diagrams printed on the side or top. There are some that have two NO output terminals, but you want one with a NO and a NC terminal.