PayPal Digital Gifts on eBay has $60 PSN credit for $50 right now for anyone interested.
EDIT: You'll be receiving TWO emails with your credit; One is $10, and the other is $50. Just a heads up.
EDIT 2: It's sold out now. Hopefully some of you got it.
It's only 1/2 as good, but PayPal Digital Gifts on eBay currently has $100 of GameStop credit for $90 ... delivered as 2 codes once again.
It's not 20% extra (only 11.1%), but at least you can pickup both XBL and PSN credit via the GS website with the GS credit ... and it's a little less expenditure than the "buy $150 of BB credit, get $10 eBay credit" (merely 6.7% bonus, and it's not even BB credit you get).