Ap doesn't have an online store.
Apbands is a 3rd party strap maker that makes ap straps.
However , nothing beats the original ap made straps in terms of quality, comfort and ease of strap changing.i have bought Apbands straps before but had issues changing the straps because they don't have the metal lug molds to ensure a seamless change. U need to buy the necessary tools to change the strap yourself but ap service centre will not change 3rd party straps for you.
I would suggest ordering directly from ap service centre in your country or city. You can check online where the nearest ap service centre.