2 X Pampers Baby-Dry Mega Pack Nappies £26 @ Boots
This is the cheapest I could find for this particular brand, Pampers Baby-Dry Mega Pack nappies. Boots are selling them on special offer at 2 Mega Packs for £26, which comes to £13 each. The cheapest I could find for a Mega Pack was at Tesco, which has a pack for £14.99.
Collection in-store is free, or if you spend over £45 delivery is free. Standard delivery is £2.95. The link above will take you to one of the mega packs - do a search on the site to look for more.
I would be tempted to get four packs at this price, especially if you really like this brand. It was my favourite when my son was in nappies - for some reason Huggies never fitted him as well and there was often leakage. That said, I have friends who say the same about Pampers! It does depend on the child. I never really got on with the own-brand nappies either for the same reason. It would seem my son was capable of weeing through just about everything!
When I checked, some of the mega-packs were already sold out so I wouldn't wait if you want to grab this bargain. If you are a member of the Parenting club, log in and try one of these codes - you might just get another £5 off. It didn't work for me, and I suspect that's either because I've already used a £5 off voucher OR it won't work with already discounted items. However, it is worth having a go yourself as apparently it has worked for other users (over at our sister site HUKD). So try all four codes - some work for different users: PCBS23, PCBS43, PCBS24, PCBS42.
Thanks to theguv at HUKD!