I am trying to buy a product from Guam

I am trying to buy portable hard drive from apple store online.

I have checked the available countries which contained Guam I live in.

So I continued to order the product and filled up my address but it appear as an error.

How can I solve this problem?

I was finding ways to contact apple but I can not even make calls to apple support since the call making to America appear as "International Call".

And I've been finding e-mail support thing for online store but the chatting service won't let me go through because it says I am not in US and also, there are no such thing as e-mail support so I write this on community help.

Please find me solution for this.

P.S. I was trying to add the screenshots of my problem but it won't let me add a photo.