Use a VPN

Many websites reject orders made from computers with IP addresses outside the US.  Other retailers might direct you to their "international" store, where they often increase the prices and limit the availability of many items.  

Since you are actually shipping your purchase to your US address at Pacme, a simple solution is to use a VPN service that will make it look like you are ordering from a computer in the US.  

Using your VPN, you first log into a gateway located in the US, then seamlessly visit the shopping website to make the purchase. All your web traffic will then go through your VPN tunnel so it appears as though you are in the US.

A good VPN service will also encrypt the connection from your computer to the Internet.  In fact, many of us use a VPN everyday.  Whenever you log onto the Internet from a public access point (e.g. Starbucks, airport free wifi), it is a good idea to use a VPN.