Went to Wickes Norwich wanting to buy the Tarmac sand on offer the other day at 2.99 a bag for 3. They didn't have any so went for the 4.99 a bag Hanson sand at 4 for 3 expecting to pay 14.97. It scanned at 6.97 for 4 bags. The receipt shows the 4.99 discount for "project saving" plus an additional 8 pounds off "bulk saving" (no idea what the bulk saving is for!). So basically 100kg of play sand for 6.97! Assume national as they wouldn't just programme this locally to scan at this price. 1.74 a bag but assume you will have to buy 4 to get the price.
Hanson Play Pit Sand 25kg maxi pack. Advertised 4 for 3 at £4.99 each. Scanned at £6.97 for 4 bags total 100kg @ Wickes