i do agree, actually under cabinet leds flashing kit doesn't cost more than $6 and takes about 15/30 minutes to make.
you can find 16 feets of 5050 rgb led strip about anywhere on paypal for $12, good for 4 machines if you use 3-4 feets for each machine. so that's $3 dollards per machine. the wires to go up the mpu board is about $1, a z connector and a molex plug another $2 (and i'm generous) connected to any mpu in the flasher lamps/special coils plug (it says on the mpu flasher lamps).
infos to make this as been on the net for the past 2 years and here about a year+ ago.
so yes, $5-6 is about right.