Went into Wilko in the Rivergate shopping centre in Irvine today and they had a discounted trolley right at the front of the shop.
Picked up two of the smaller tubes of dry shampoo for 50p, but they also had the big tubes for a £1. Also got Sanex and Dove roll-on deodorants for 40p and 60p.
There were quite a few other things there as well, like Nivea for men facewash for £1 and Veet hair removal cream for £1.50.
Not sure if it's a national deal but worth a look :)