99% sure I understand. Would this work as an example? https://www.amazon.com/Adapter-100-240V-Transformers-Switching-Wireless/dp/B073WSWT34/ref=sr_1_1?m=A28DFNI3481CTT&marketplaceID=ATVPDKIKX0DER&qid=1642589768&s=merchant-items&sr=1-1

Also I find it strange that none of these have the grounding prong. Doesn't that introduce unnecessary risk of blowing up or something? EDIT: Well I'm an idiot, 1 option over is the grounding version haha.

I'm not sure about newer machines, but the older ones were 12V 3A PSUs. Ones that will work with "Arcade1Up" will be priced higher.

But pretty much any will work as the 5.5/2.5-2.1mm barrel jack is fairly standard.

I personally prefer inline versus wall warts. Here's one that after 5% clipable coupon is under $10.

https://www.amazon.com/Facmogu-Connector-5-5x2-5mm-5-5x2-1mm-Transformer/dp/B073WSWT34/

the OEM mighty charger is cheap (low quality) AF.

what you want is a charger for a streaming box/security camera/laptop, the brick style not the wallwart style - https://www.amazon.com/Adapter-100-240V-Transformers-Switching-Wireless/dp/B073WSWT34

look how thick the wire is compared to the other one