The somewhat amusing thing about many of these "deals" is how the price of items has been inflated for this weekends sale, easiest to see this at Argos where online they have to put further down the product page if its been on offer cheaper recently. So a lot of kids toys have 25% off, but if it was 20 and is now 15, underneath "note this product was previously on sale at 12.47"...
...good marketing though.
TV wise though I;d always go to Richer Sounds, their advice/aftercare is very good at their prices already beat supermarket offers, 5 yrs warranty for 10% of purchase price is awesome lol.