According to Bob (Armscor Manager), IDPA started first in Cebu. Don't know where in particular. IDPA in Armscor started only last year. If you'll go to Cinema Square, all the gunshops there have an IDPA poster. My initial is CR and my mobile is also listed in the poster.
mco is right. There will be an upcoming IDPA match this May 12. Hope to see you in Armscor. BTW, you Manila based?
vega