I did not see them listed at Vertigo Drones, but it might be worth a phone call to check.
You can also check your local auto parts store. They tend to have generic switches of this size/type available.
Are you certain the switch is bad? The Typhoon H is a little notorious for jammed landing gear. They often don't appear to be reacting at all, which could lead to diagnosing a bad switch when the problem is really something else. If either side is jammed, neither side will cycle.
Also note the landing gear will not work while landed unless the Typhoon H is turned upside down. If you turn the drone upside down and hear a faint click from the landing gear when you cycle the switch, you probably have a jammed gear.