One of the sport shops at the Mall of Asia is Toby's. I didn't want to waste our trip there and so I looked for swim items that were on sale. And here's one (Zoggs-Otter) I got for Php230. You know it's on sale when shop personnel has HANDWRITTEN the price on it.
With a swimming family like mine, you can't go wrong with plenty of spare goggles. And so I buy goggles on sale. Cheap for me is less than Php300.