I bought an Amscope (clone?) from Ali a few years ago, Price including shipping was around (below?) EUR400.
If you are cost sensitive, but can make things yourself, then I recommend to buy the microscope head only and make the rest yourself. Accessories are relatively expensive, and not of very good quality. Just the Z-adjustment for example costs around EUR65, a simple stand (which I bought) around EUR100, and the big boom thing itself is a few hundred EUR. Just have a look at what the parts cost on Ali. They are also sold separately.
Handy parts to have are a 0.7x Barlow lens (I have a 0.5x, but now the eye pieces are quite high above my desk. Also get yourself a ring light with an integrated glass plate. This protects the lenses from solder fumes and spatter. When you use a (replaceable) Barlow lens, this is not very important, but if you want to use it without a Barlow lens the underside of the microscope is open (or at least add a piece of glass / filter there.)
I bought the simple stand "to get started", and with the Idea to make a more luxurious stand myself, probably with MGN12 rails, and very likely some stepper motors. If you put stepper motors on both the Z-distance and zoom, then you can write a simple microcontroller program that takes two potentiometer inputs. One for zoom, and one for focus, and then when you change the zoom, the uC keeps your object in focus by also adjusting the Z-height. Uc also can adjust the light. There is a very big difference in brightness between zoomed in and zoomed out. The difference is big enough to be (slightly) annoying, and I tend to adjust the brightness when adjusting the zoom level.
When you DIY, a built in fume extractor is also nice t have.