I like the idea of a heated coaster for myself!
My dh and I have stuff we get each other as standard every year to add to our collections. This includes
An album on vinyl
A pop funko
Lego (usually technic for him and HP for me)
Rugby shirt (for him)
Books (for me)
I'm not sure I'll be able to afford anything out of the standard this year but I'll list some ideas I've had and some things I've got in the past
Clothes (band t-shirt, shoes etc)
Headphones
Rugby tickets
Gig tickets
Video games
Framed song lyrics of his fav song
Foot spa
Books
Engraved zippo lighter (when he used to smoke)
Aftershave
Graphic novels
Jewellery
Electric shavers
A guitar (I also done a treasure hunt for him to find this)
An old game boy with a Pokemon game
A model of his favourite car
Ukelele
Hotel night
There is a lot more but I'm struggling to think right now!
I'll list what's going in his stocking this year plus some past hits
Haggis crisps
White hot chocolate
Skittles (varied flavours)
Other sweets
Scratchcards
Beard oil/balm
Beard comb
Toiletries
Tickets to a rubbish metal band he likes
Boxers
Socks
Guitar picks
Guitar strap
Guitar chord book
Mini rugby ball
Mini lego set
New wallet
Keyrings (lego star wars one)
Star wars joke book
Portable charger
Headphone holder
Gift cards (xbox, restaurants he likes, cinema, Google play etc)
Magazine (classic rock or something similar)
A lot of these things are depending on interests/taste but hopefully it provides some ideas or helps you think of other things.