I have a Bushnell gun for sale. I bought it last fall. I played with it a little, but never really got to use it. I'd call it "new", but it has a few fingerprints on it.
Gun, carry case,instructions...........$160 plus postage.
I bought it in late fall and never got to use it at the pond.
I'm told that the trouble with "inexpensive" radar guns (those under $500) is the angle of the moving object. You should be shooting straight at the object. If you are more than 10 or 12 degrees out of line, it won't read.
It's a beautiful day here in the Chicago area. maybe I can dodge the yard work and go to the pond........If I go, I'll give it a try.