Half Term Half Price Toys @ Argos
There are great offers for older or more active kids, like the Sportspower 10ft trampoline* which was £199.99 but is now £99.99. If you buy a Sportswear trampoline there's also a special offer of £10 off trampoline kit, for things like stairs and so on.
For something with a somewhat more indoor focus, there's £12.49 off the Barbie Endless Curls Doll*, making it cost the same again.
Boardgames are reduced too, with for example My Monopoly* costing £10.99 instead of £21.99. I think this is pretty genius actually, as My Monopoly includes blank tiles and stickers so you can make it your own. You can print out the sitckers to personalise your tokens, properties, and even Chance and Community Chest cards.
If it's your thing - or you know someone whose it is - there's a giant Star Wars Darth Vader Action Figure* currently reduced to £19.99 too.
Thanks to edandhen at HUKD for that last one!