Only valid for 3 months, but till midnight tonight 600 print credits are only £9.89 at Photobox - postage is extra. Works out at 1.65 pence each, usual best price is 5 pence. Voucher codes don't work with print credits.
It is a pricing error as the real price should be £42, so be quick
They take credit cards and Paypal. New customers get upto £6.50 Quidco and 50 free prints
Regular customer quidco is 5%. Tracked at 41p for me