I almost missed it, but Playstation emailed me a $10 credit for PS4 yesterday 9/23, I'm almost sure this is a targeted email I just don't know who they're targeting. I am a PS+ member btw so that might be why. Check your emails as this has to be redeemed by 9/30/16..
Search for an email from PlayStation with subject "Here's $10 on us!"
and inside is a unique code you can apply to your account
The credit will be added to your wallet so if you have previous balance in there such as another $10 for attending the E3 event at your local theater it will stack. I bought Unravel $19.99 with the combined $20 credit from them no tax.