03-7449-R is listed at 9.95 a pc. but doesn't show the face, not sure if this is the same and if it is would have to be riveted on to arm.
25 bucks for a used drop target is indeed pricey. Then again, unobtanium can get expensive. I would just worry about it breaking again.
I would have a machine shop mill a few squares out of aluminum or stainless and reproduce the graphics.