Try looking in a golf shop.
Not for the ones that work on angles (measure from top of flag to bottom of flag), but for the ones which are point and shoot so to speak.
You will find that golfers pay less for exactly the same thing that we want!
I bought a Longridge Pinpoint Pro a few years ago for half what a Hawke LRF 400 was being sold for exactly the same mechanism, case, just different name on it!