Swap Amazon for Harbor Freight and I can add a ton to this list.

33 piece security bit set: https://www.harborfreight.com/security-bit-set-33-piece-68459.html
36 piece security bit set: https://www.harborfreight.com/3-in-screwdriver-bit-set-36-piece-68817.html
100 piece security bit set: https://www.harborfreight.com/security-bit-set-with-case-100-piece-68457.html

Dogbone for removing leg bolts and head bolts no matter what size you have: https://www.harborfreight.com/collections/sockets-ratchets-wrenches-pliers-screwdrivers/8-in-1-sae-socket-wrench-60830.html

22pc screwdriver set: https://www.harborfreight.com/hand-tools/screwdrivers-nutdrivers/screwdriver-set-22-piece-69420.html
4in1 screwdriver: Perfect for playfield rebuilds because its one of the few with a hollow shaft big enough to fit over metal playfield posts: https://www.harborfreight.com/hand-tools/screwdrivers-nutdrivers/4-in-1-screwdriver-with-tpr-handle-61988.html
7pc hollow shaft nutdriver set: https://www.harborfreight.com/hollow-shaft-sae-nut-driver-set-7-piece-69239.html?_br_psugg_q=nutdrivers

Rubber mallet for installing dark or light t-molding: https://www.harborfreight.com/1-lb-rubber-mallet-with-fiberglass-handle-95083.html

HVLP self-contained paint sprayer for doing cabinet stencils: https://www.harborfreight.com/2-stage-portable-hvlp-paint-and-stain-sprayer-64933.html?_br_psugg_q=airless+paint+sprayer

Doing playfield swaps?
https://www.harborfreight.com/3-piece-drawer-organizer-set-99731.html
https://www.harborfreight.com/11-compartment-drawer-organizer-99730.html
https://www.harborfreight.com/6-compartment-drawer-organizer-99729.html

Small parts storage: https://www.harborfreight.com/tool-storage-organization/parts-storage/40-bin-organizer-with-full-length-drawer-94375.html

Tie down straps: https://www.harborfreight.com/400-lb-capacity-1-in-x-15-ft-ratcheting-tie-downs-4-pack-63094.html
Tie down strap storage: https://www.harborfreight.com/050-caliber-ammo-box-57766.html

Dolly for moving arcade games easily: https://www.harborfreight.com/30-in-x-19-in-1000-lb-capacity-hardwood-dolly-58316.html?_br_psugg_q=furniture+dolly

Moving blankets: https://www.harborfreight.com/72-in-x-80-in-moving-blanket-58324.html?_br_psugg_q=moving+blankets

And finally, what I think is the best thing I ever bought: https://www.harborfreight.com/3-in-1-convertible-hand-truck-56409.html
I bought mine from Costco for $99, but they no longer carry it.