There's a big difference in the price, depending on where you get them from.

Ebay, and far-off lands buys you the camera and lens assembly like the one in my Amazon.co.jp link for $69 plus shipping.

https://www.ebay.com/itm/185414788304?hash=item2b2b9524d0:g:pXMAAOSwRTxh4AgU

It's twice that, for just the camera, on Amazon.com

https://www.amazon.com/HAYEAR-Industrial-Electronic-Digital-Microscope/dp/B07NSNQSGK

With the Ebay link, you'd need to buy a cheap 12v power supply for it, but the cost saving is huge.

A stand, like the one on my Japanese purchased microscope is $30 on Amazon:

https://www.amazon.com/TOMLOV-Universal-Extension-Microscope-Gooseneck/dp/B094J5SPDZ

You'd probably want to double check the diameter of the lens with the Ebay vendor to ensure it'll physically fit the stand, but I think they're all about the same size, so you're likely fine with that.

Thereafter, it's a case of scrounging a computer monitor or TV from somewhere (which is 1080 and has HDMI), but that's trivial.

You'd end up with functionally the same setup I use to rework £££££ PCBs on a daily basis at work.

It's always difficult, trying to price and recommend stuff for home-use for people. The problem is that, in terms of functionality, the requirements are the same for someone who's fixing a Gameboy cartridge once every six months as they are for me, working on £5000 PCBs daily.

With tools, limitations which may not seem significant initially (latency, working distance) are the difference between a tool that's super useful, bordering on essential, and one that doesn't really work for the purpose for which it was purchased.

Assuming you can beg, borrow or steal a screen, and went for the Ebay-from-far-off-lands route, you're at about $100. The end result would be about the same as what I have, which compares very favorably in use to my big microscope which cost as much as a car.

Other than that, it's hard to recommend something lesser, because the usability just won't be there.

Good luck with your purchasing.