Magnet Set (2)   $9 (inc US shipping)
Magnet Set (2)   $22 (inc INT'L shipping)
Magnet Sensor & Magnets   $29 (inc US shipping)
Magnet Sensor & Magnets   $42 (inc INT'L shipping)
Optical Sensor   $35 (inc US shipping)
Optical Sensor   $48 (inc INT'L shipping)