If your budget is around Php1800, you can join this group:
https://www.facebook.com/PagnatSaka

Other adventour groups with Php2500-4000/pax rate:
https://www.facebook.com/TrailAdventours
https://www.facebook.com/pilipinasroadtrip
https://www.facebook.com/groups/extremeoutdoorclub/
https://www.facebook.com/groups/traveltipid/
https://www.facebook.com/mountpulag
https://www.facebook.com/atatoursph
https://www.facebook.com/arcobaleno.trailoutoursph
https://www.facebook.com/beyondoutdo...resphilippines
https://www.facebook.com/bigfootadventuresphilippines
https://www.facebook.com/byahengvictory
https://www.facebook.com/SulitOutdoorTrips
https://www.facebook.com/TRIPinas