Discounts at Smyths
Products that are discounted are shown in the new Smyths Quick Shopper page (linked to on the menu of the home page) and prices will also be shown under the 'For Sale' tab of set details pages, such as this one (which incidentally is almost half price!).
Prices will be updated every day. They are not alerted in the same way that Amazon prices are, but they probably could be (along with Argos for that matter) if you felt it would be useful.