For tracking, YMMV depending on terrain and the like, but the handheld ones should handle a blood trail just fine (last I looked at them they were $800 or so, but that was a couple years ago). The most important thing is to stick to companies that are established in that tech and not chinesium (*cough* ATN *cough*).Are any of the sub-$1000 monoculars worth it? My use cases are finding animals in fields and woods in the dark, and potentially tracking wounded game.
What would see a deer or coyote at 300 yards, or a turkey in a tree at half that?
But, for 300 yards, to ID you are going to need a proper thermal. Buy once, cry once. Used FLIR's come up often enough, or buy a Pulsar new (or Trijicon if you want really nice). Read up on the tech though: core, resolution, refresh, etc. are all very important.