Oh my. I only have 1 set of dice, although I've only recently started. The core 3 books: I've been waiting since June or whenever Mordenkainen's tome of foes was released and subsequently recalled: They still haven't shipped fresh alternate art covers to Australia yet: I'm starting to get angry. I'm starting small though. I do plan on expanding my collection.
Dice and Other Miscellaneous Magic Items

I bought a pound of dice from Chessex - that was fun. Means I can roll a d20 for each enemy all at once instead of one after another. And makes higher level spell damage much easier too (8d6? No problem!) There are nicer dice in that and some that are bit meh, but that's okay - as DM, it's more about the legibility of the numbers (some of them had black numbers on a patterned background - not good). I've also got the occasional nice set of crystal dice, which I always enjoy.
I have always had a fascination for dice and other stuff like them, does anyone else feel that way?
My current collection (not counting the around 20 lost dice) includes 64 dice:
-1 large d20
-1 d30
-1 mini d4
-1 mini d6
-1 mini d8
-2 mini d10s
-1 mini d12
-1 mini d20
-7 d4s
-6 d6s
-7 d8s
-11 d10s
-8 d 12s
-8 d20s
-7 Magic: The Gathering life d20s
and (not included in the count)
-1 deck of Curse of Strahd tarokka cards
-3 decks of Bicycle cards
-3 DM screens
-30+ books
-hundreds of maps
-1 set of map tiles
-a lot of notebooks and binders
-over 50,000 pages of notes (at least 5,000 new ones made per each year, I may have a problem)
-1 Pokemon coin (d2)
-1 bouncy ball (d1)
-and 1 googly eye (I listed this because it is kept with my dice)
There are also tons of other things that I did not list, does anyone else have a situation like this?