Zink (Polaroid Pogo paper) are currently selling for £4.29 for a pack of 10 sheets on Amazon, but PC World are discontinuing the product so are selling off all their stock of Zink paper.
I've just raided the Christchurch store and bought 24 packets of 10 sheets, at 47p per pack!
Also, some of the packs went through the till at buy-one-get-one-free (not sure why because it wasn't advertised!), so I ended up paying about £7.50 for 240 sheets.
Get it whilst stocks last!