Price breakdown for the kits I make for all my games:
Monster USB' White LED strips (Walmart). I like these because they have a remote and you can switch from 4 shades of white, so one of those shades works for every game $5.99 x 2 = $12
Angle bracket rail 4' (Home Depot) $7ish x 2 = $15
Roll of magnet tape (don't need to install tape the full length of the rails. I use three 8" strips spaced apart, end, middle, end) - $6
Superglue (I glue the LED strips to the rails because their adhesive can come loose) - $1
Appliance extension cord (I have a lot of spare cords so never buy one) - $2?
USB power adapters (I have a lot ofold iPhone/phone USB wall plugs and use those - $$?
So my kits are under $40 to make, very easy to make. You're just cutting the LED strips to length and gluing them on the inside of each rail. The rails are perfect length, so no cutting those.
Plug the USB cables from the lights to the extension cord ran from the service outlet to the back bottom of the cabinet. Plug them in. They will not turn off/on with the game plugged into the service outlet, but I power all my games from a master switch, so they do turn off/on with the game.