I hope someone finds this useful. I have been taking full advantage of Mothercares price match policy as well as the 10% discount they are offering to their members of the baby club.
The Grobag in question is for sale at Mothercare for £28.
Mothercare price match and have found the Grobag for £19.49 at allbabyneeds.co.uk.
All you need to do is show the price on screen of your phone (mobile internet). I often use the price comparison barcode apps on my iphone.
It is easier to get this price by going in store. If you are register with the Baby Club, you will be able to get a 10% voucher to use in store.
This then brings the price down to £17.25, the cheapest that I have been able to find it.
You can do the same with each of the grobags listed on allbabyneeds site.