The Coins (which are the same as the ones in the LOCK graphics) & Kili's runestone are Weta movie props you can find for sale. I linked a couple, but just Google/Ebay/Amazon around. Weta also made a shinier gold version (I opted for the less shiny myself)
The swords (Orcrist, Sting & Galmdring) are Noble Collection letter openers (shiny metal, reflect the lights great). Come in a set or individually.
The Erebor Key is actually a pen from the Noble collection (with the pen part removed):
**Although I might replace it with this one: https://pinside.com/pinball/market/shops/1166-pixels-arcade-games/04669-new-glowing-key-to-the-lonely-mountain-mod-for-hobbit-
The Map to Lonely Mountain, Burglar contract & Bilbo portrait are tiny replicas made by a guy on Etsy that makes tiny movie replicas. Hunt around there. The burglar contract actually fully unfolds all the bits just like the movie version (I just have it folded up to cover the bare metal book stand)
Bag End is a 3d printed model by a guy out of Poland for the War of the Ring boardgame, I just asked him to print it larger than normal with a 5cm base. Then I primed and hand painted it myself, varnished it with polyurethane to give it enough shine to reflect pinball lighting. (I actually ordered two, one to practice painting on first). I just checked and unfortunately his store is closed right now due to cancer (best wishes man!), but you might find something similar on Etsy: https://www.etsy.com/shop/EagleNest3D
The Giant Eagle is a D&D miniature. Primed, hand painted it (movie clips as color reference), varnished it then pushed a clear rod into it, put a wiring clamp bracket on the other end of the rod and mounted it to a post so it is suspended above the playfield. Playfield art shows an eagle flying up the right orbit so I mounted the Eagle so it looked like it flew out the left orbit.
The Giant One Ring is the same ring used in the shooter rod mentioned earlier (I also got the shooter rod). They sold me one separately. McGuyvered a metal bracket from wiring clamps and covered it with white heatshrink, mounted it to a post so it's suspended out above the right outer ring lane.
The Arkenstone mod & Arkenstone mod lighting mod (ha!) you can also find for sale here on Pinside. The lighting from Trumpanche who posted just above me. Led lighting in the back probably can find here or mod stores as well. Same with the volume controls, trough led lighting. Spotlight risers, Bag End shot 1-way door etc... Probably forgetting something.
Hope that helps