Prior to Xmas, there was the glitch for 2 PJs in a bag for £20 delivered, this isn't quite as good but nevertheless it's a decent saving to the RRP (£34).
Plenty in stock of the Paloma check variant in different sizes at £10. There are a few other designs for £12 and £15 as well.
Delivery is £3 (free if you spend £40+) or free to collect instore.
EDIT: All options are £10 each.Thanks to Saffstar.