I went for this one after I found it difficult to try and use my non-DSLR cameras, and didn't want to tie up my phone.

It's a little buggy, a little quirky, but after some trial and error, it gets the job done.

My Microscope is the OMAX M8311Z
I got it bundled with a A1PHC2 Condensor and extra objectives for Brightfield, Darkfield, & Phase Contrast support.
And I collect the footage with a HAYAR microscope camera and an OMAX 0.37X Reduction Lens.

There are cheaper solutions, and much more expensive solutions. All this cost me about $900.