I got an email from PlayStation the other day with this offer.
In the UK Paypal (not sure if world wide) is doing a office with PSN. Transfer £50 from Paypal to PSN account and get £10 off.
Expires by: 01/08/2015
hope this helps people out.
EDIT Screenshot from the PSN Store UK (showing this offer)
http://i59.tinypic.com/oj3vd3.jpg
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Well I've never seen PayPal offer psn credit. Ever. Also, no email from either.