Lazada has a Gopro "flagship store" that appears to have the hero 5 and 6 in stock. SM / Ayala in cebu also got several stores that sell them. Bacolod probably as well.
If your like me and would never buy anything on-line, you may have to go to Cebu. They have many places that sell go-pro along with every imaginable accessory . There are also many knock-offs that are made in China in Dumaguete. Stay clear of those as the quality is less. In Dumaguete there are persons in classified and 1 or 2 shops selling 2nd hand. Stay clear of such and go new IMHO. Here is a thread that can enlighten. Good luck Grand- P. https://dumagueteinfo.com/board/threads/gopro-store-availability-and-best-price.23608/
Haven't been for a long while and surely some other member can confirm, but there used to be a display cabinet and ability to buy at Hayahay Bar.