Same here when I just tried yesterday. Was on the Razer Store page, could not checkout--failed to load the shipping page:
https://www.razer.com/checkout/delivery-method
Webpage shows a loading progress circle. Opening Developer Tools shows page errors.
I reloaded the website in Microsoft Edge, which I confirmed works (but by then the product I was trying to purchase unfortunately sold out).
I verified Adblocker is not turned on. Also I was checking this Reddit page at the same time which also does not load:
https://www.reddit.com/r/MouseReview/comments/10rte3x/razer_viper_mini_signature_edition_priced_at/