I've been using these for a couple of months and I'm quite happy with them. The buttons light up but you can click around to find similar that don't.

I added these to get P1/P2 and coin buttons, or you can pop apart the buttons on the kit I linked to add your own custom labels. These buttons are nice because you can just not connect the lamp if you want. They work just fine with the USB interface that comes with the first set I linked.

Player 1 and 2 buttons
https://www.amazon.com/gp/product/B01N5Y8E2Z/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Square buttons
https://www.amazon.com/gp/product/B06XBLH25X/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

These are powered from a USB cable sourced from a non-powered USB hub that I plugged into the USB out near the bottom of the monitor. The LEDs are wired in parallel.
https://www.amazon.com/gp/product/B00JX1ZS5O/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1