Quite a local one, but DW sports at the Royal Quays (North Shields) near Newcastle is closing down to make way for a trampoline park.
The store has 50% off the lowest marked priced on everything, the sale has been on going for a few days but only just found about it now. I got a pair of Nike Air Max command for my youngest (chavvy I know) for £22.50.
Under Armour tracks for myself for 12.50 as well as adidas tracks for a tenner.
Worth a visit if local.