@addicteetopawpatrol hello!
My asd son is also 5, but he's more interested in technology these days, he loves very specific games.
Before he developed these interests his only interests were food and drink related so we got toy kitchens and role play food.
Unfortunately my little autismo really loves branded/logo types of things so I had to spend a small fortune on second hand mcdonalds branded toys. (Like toy tills, not happy meal toys.)
The problem we have is if he loves something it can cause major problems because he'll obsess over it and become violent if he can't use it, because otherwise I'd have bought a soda stream for him but he'd want it for every drink, let alone once a week as a treat.
If you're after large gifts to stick under the tree, how about a massive art set/one of those interactive toys, such as a dinosaur or dragon? Also Google Melissa and doug toys if you're not keen on plastic toys (as mumsnet hates plastic!) They're mostly wooden.
Has he got a star projector? Again, my DS loved his but it created too much anxiety for him, he became so obsessed with it and broke it in hours, the next one lasted a day which was progress but again, we had to stop getting them for him as it just got him too excited. Amazon have some amazing ones!
Playdough/plasticine/hand puppets
Those water art books if you hate the mess crafts bring are handy!
Dressing up outfits (sainsburys has great gruffalo ones usually)
Karaoke machine to practise speech with singing? Especially with a projector, get a disco going!
We've bought sensory toys for our 5 year old and he's not been massively bothered by them tbh.
Does he like cars? Hot wheels seem popular with the asd kiddos just to collect tbh.
Whats his bedroom like? My eldest is mildly asd (compared to younger asd dc) and he liked framed pictures of things he was interested in, that was a physically large gift but very inexpensive which was a win!
One Christmas my eldest asd dc asked for a star wars birthday cake, so i got it despite people saying it was ridiculous but meh, it's difficult enough knowing what they want, so I'd not turn away suggestions.
If your DC has any specific interests let me know and I'll have a think/ask my asd mum pals if they've any ideas.
My son also doesn't know the difference between a big present or a stocking filler, so things like lunchboxes with things he likes on have been as much as a big gift as a bike has 😁
Also if you want a large "wow" gift, I picked up some go carts for cheap on fb Marketplace and my DC loved them!
Hope that helps a bit, it's crap being stuck for ideas x