There's a new PSN Promotion.
It runs from Today, November 26th 2013 through to December 3rd 2013.
If you spend $60.00 from your PSN wallet you will earn $10.00 back in bonus credit.
Please note however that the most you can accrue in credit is $10.00, unlike previous promotions where the more you spent the more credit you accrued there is this time no multiples avaialble for spending more.
You can expect the $10.00 credit to be sent to you in a code in a PSN message by 13th December 2013, the code will expire on January 13th 2914!