Available both online and in store. I got mine in the Bury store today and they had five pally sized boxes full of them.
RRP is apparently £21.99 TJ Hughes are selling them for £4.99 a pack.
Online reviews for these pillows seem quite good too.
If you buy online you automatically get 10% off your first online order. You also get £1 off by liking their Facebook page whilst at the checkout, combine this with free click and collect and the pillows cost just £3.49!