Hi Truro,
I can only give you some general tips, as you haven't given many details on what you are looking for.
There are 3 situations for buying condos here in Metro Manila, 1) the building isn't built yet and you are buying a new unit on specs and photos, with no guarantee of a move in date, 2) the building is built, and you get to choose what is left over, 3) you are buying from an owner and not the developer. Depending on where and what, these choices may be different.
Also, are you looking for a high rise, medium rise, ... ? Do you want/need amenities in the condo, or else close by?
And never forget that buying into a condo means additional expenses throughout the year for insurance, taxes, and repairs on the common areas.
Anyways, a good place to start looking is online, at the developers sites, at online search sites, etc, to give you a general idea of what types of units are out there and their costs.
Good luck in your search.
Thomas