The Game Awards 2015 Sale:
The sale ends the 06/12/2015.
Please note: To access the US web store, you need to be logged into your US PSN account or signed out of your existing account. Otherwise it will redirect you to your local store.
Setting up a US PSN account on your PS4 is a simple process (check here). You will then be able to buy games on the US account and play them on your SA account.
You can also load funds onto your US account by buying PSN vouchers from Amazon.