We don’t really have a set budget per child but I concentrate more on making sure they have the same amount of presents to open. This works better for us at the moment although I’m sure as they get older it’ll change.
Ds1 9 years old / Ds2 8 years old
Telescope / LEGO indoraptor escape
LEGO Minecraft Ocean monument / LEGO Dilophosaurus outpost
LEGO Minecraft Ice Spikes / LEGO city arctic base
Pokémon Elite Trainer box / Peacekeepers Military Base
“Knot It” knot making kit / Nat geo Dino fossil dig
Pokemon Lunala tin / not sure on last one for ds2
Then stockings
Ds1 Compass, Pocket knife, mini Newton’s Cradle, iTunes gift card, MP3 player, orbeez, underwater predatorstop trumps, chocolate coins and satsuma
Ds2 Compass, Pocket telescope, mini Newton’s Cradle, iTunes gift card, MP3 player, orbeez, Dino top trumps, chocolate coins and satsuma
When my ds1 went through a stage of not really playing with toys much he got things like chemistry sets, electronics snap circuits/brain box sets, little science sets like the lemon clock and saltwater robot etc, I once bought him a new desk, one of those with the lift up lid and I filled it with all new pens/paints/paper/craft materials etc. cost me about $40 altogether as I got the desk from a charity shop. He was absolutely over the moon with that.
My Ds2 got a spy kit for his last birthday, I bought all the bits separately and put them together, spy goggles, walkie talkies, spy pens, notepads, spy glasses etc, he loved it.