Tesco INSTORE - 2 tubs of Pringles for £0.99 (Buy one get one free) with the majority of flavours (Sour cream, Original, Salt & Vinegar, cheese and onion and Texas Barbeque, etc).
This may be partly connected with a previous post:http://www.hotukdeals.com/item/494725/pringles-buy-1-get-1-free-tesco-1-4
In the above post there has been some confusion about the price Tesco were supposed to be charging - also currently seen at this price on Tesco website but doesn't seem to recognise it when you check out.
Thought I would add this as a New deal as it seems to be slightly different (and the above one is expired from 4 weeks ago):
Possibly store specific. The store I saw them in was Gatwick (Hookwood).