Small magnets for sensors

Not sure this is the correct forum, but I need the small magnets for my door sensors.  I have one that was sent to me after I call for support on the initial install, but I need all my sensors to have the small magnet.  My door molding is very ornate and thick and I have had to tape the magnets on the molding and sometimes they fall off or the sensor does not register.  I've called the support numbers 888-910-1215 and 800-297-1605, no answer, on hold for 30+ minutes listening to music.  I'd like to order 7 of the small magnets.  

Someone, please assist me.

Gary Lawson