Presents and stocking fillers for 18month boy

[gladis]

I also have a 14 year old stepson and 4 year old daughter. The problem is that we have so many old toys from when they were young that I am at a loss what to buy for him. We tend to be quite generous at Christmas time and my daughter is so easy to buy for as she's very into games/crafts/learning. I already have 25 things on her list without even thinking about it (lots of little things mainly).

On my 18mo's list I have:
Ride On toy (trying to find one with home friendly rubber wheels)
Low play table to put toys on.
Fun picture for his bedroom
plastic truck (will be one of many)
NokTok cuddly (not a great filler, but better than nothing)
Farmyard jigsaw puzzle
Chuggington train

Can anyone think of anything else/anything fun - especially smaller things?

Many thanks.

something musical - small shaker or bells or something?

elc little people do a santa set with santa, sleigh, tree, snowman, reindeer - fun to play with over xmas and then can disappear to reappear for years to come

chunky crayons and paper so he can be like his big sis and do some crafty/drawing stuff

little book of a character he likes

my ds2 who is just a bit older likes to have two of things so he has one for each hand, has done ever since he was little, so a pair of trains or pair of people etc

he also adores megablocks stuff and duplo stuff - will sit for hours putting it all together. some of the basic blocks and a few of the special blocks with face bits or animals on to make it a bit different. asda last year had a bag of 100 bits for £10

Thanks for the ideas zipzap. I like the Santa idea.

extra stocking fillers:
Books
Crayons
Character bubble bath
Toothbrush
Satsuma
Chocolate coins/mini Santa type things