I think this is a fantastic deal, available in variety (salt and vinegar, salted , cheese and onion and beef) or plain.
99p for 12 or £1.50 for 24 (2 for £1.50)
This was in The St Helens Cooltrader.
Not sure how long the offer will be on for but i got mine today :)
Just over 6p a bag if im correct