Crinkles- Yes, it's very easy. The UPS store is another place that forwards mail/packages for people.
Call the UPS store closest to the Systems 76 business. You might have to call the Systems 76 company to find out where that is.
Call the UPS store and tell them what your plans are, they can probably even give you a shipping cost if you know the weight of the items being shipped. You MAY have to sign up and pay for an address/mailbox. If this is going to be a one time deal, they might accept the package for you and then send it to you.
Then call Systems 76 and order the products, using the UPS store address. The UPS store will be watching for it, and will forward the package to you.
It might sound complicated, but it's not. Just make sure all parties are on the same page and it's easy. They do this kind of thing all the time.
Another option would be to simply have a stateside friend order the products to his/her address and then forward them to you.