Worx 400W mini circular saws in the discount section of Homebase @ Kingsgate Retail Park East Kilbride.
Discontinued item and reduced nationwide but discount varies by store according to staff.
Still a few left and I know Homebase discount is based on stock level and the less they have of an item the heavier the discount, but at £20 I'd be surprised if they discounted it much further.
Great wee tool for that money.
They also had the set with this saw plus 3 blades and a carry case marked at £45 and there were loads of them.