I have 3 boys v close in age and we both have big families so they get tons of presents and I am totally stuck for ideas of what to buy ds3 (who is 5) for Christmas.
We already have absolutely tons of Lego (inc lots of Star Wars/Harry Potter/more general Lego) and quite a lot of Playmobil (campervan and swimming pool; castle and knights; pirate ship). Hexbug Nano sets were a huge hit for birthdays. He has a decent bike and scooter which should easily do him next summer (plus we are going to my brother's for Christmas which is 4 hours drive away, so a bike would be hard to conceal in the car 
) We also have a puppet theatre, tons of dressing up stuff, EZFort...
Any ideas? We usually get the dcs one or two main pressies. Ds has no idea of value so no worries on that score I've asked him a couple of times what he wants for Christmas and each time what he's said has been a tiny stocking filler type item, bless him.