Well, like many things you get what you pay for with NV. The only experience I have with the cheap stuff is this:
Employing the latest optics-design technology, Night Owl’s monoculars optimize low-light illumination and high magnification without the extra weight found in other models.
www.cabelas.com
I used my Cabela's points on one about 10 years ago. It's a consumer-level Gen 1 monocular that requires a bunch of indirect ambient or constant IR supplemental light to be very effective. Not bad for suburban areas and just dinking around stargazing and being weird. Definitely better than nothing, but not even in the same zip code as Gen 2 and especially Gen 3 devices. I don't think you will be able to find anything in your price range that you could safely navigate in while using, but for static observation you may.
For scanning open fields & plots you might be better served with a thermal monocular. You can find a capable FLIR device for around your budget. While also not suitable for navigating safely, thermal definitely shines when it comes to
detection. NV is more suited to
identfication/classification, and nav. Just something to consider. I use both in a tandem setup, but both serve very different purposes.
WARNING: You are dipping your toe into a dark, dark pool of super-nerdy rabbit hole technology & financial hardship. The finest & most expensive flashlights are waaaaaaayyyy much, much cheaper! If you continue on, soon enough you'll find yourself giggling at how you once thought you could ever live without it, at
any cost. I told you so....