Try these:
MASPRO, Banaue near Children's hospital, look for benjie.
summer of Tsikot.com
Johstone 09175379172
goldcars banaue
carstuff banaue
malugay makati - there is a store near corner of South expressway and Malugay. Mannix at P7500, on order basis, 50% down payment, not in Karplus

Mannix before was my choice, but sync3 of Tsikot.com is also selling a 2way alarm but with a longer range.. you can check it sync3 at classified ads.