I've had luck in the past making my own.
you get one of those plastic "for-sale" signs and then one of those cheap box cutters with the blades that you can snap off.. cut the sign into strips and tape the blades onto the end of them. then hot glue it to the back of the monitor once you've got it where you want it.
the don't make them anymore unfortunately so your only options are to scavenge used ones from dead tubes or make your own.