The US PlayStation Store is running a Flash Sale this weekend, with deals under $5 (R79) on PS4, PS3 and PS Vita games.
To view all the games on sale, click here.
Offer ends the 23/05/2016.
Please note: To access the US web store you need to be 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 buy US PSN vouchers from Amazon.