I think you've been unlucky Terpe.
Generally, supermarkets are much cheaper in the Phils, as they usually are here.
It is worth bringing plumbing stuff like taps, and also electrical sockets, etc from the UK if you're planning on building a house, as quality is very poor in the Phils for the cheap locally produced ones, and you'll be either constantly repairing them or risk either flooding or burning the house down.
The situation is improving though, now that more big DIY type outlets are opening over there, offering a bigger range.
I also took all my tools with me, for the same reason.