www.mouserelectronics.com
buy them there all day long less than 3.00 each
part number is 507-ams-39w
they are white and come with magnet and reed switch i use double sided tape to secure them to a window, magnet has to be within 3/4 of inch to work. use them in conjuntion with a relay, or you can use them to ground out relay. hope this helps.
btw mouser has no minimum order so you can order only one, they have some badass switches to use with air ride also