Amscope is a reputable dealer but you can get the same microscope even from Amazon (btw, I have no popup but then I am browsing with a fairly aggressive adblocker).
https://www.amazon.com/AmScope-SE420Z-Professional-Microscope-Magnification/dp/B0080L0FYC
If you are in Europe, the GTVision (https://www.gtvision.co.uk/) sells these (among others) and they offer first class service - I have got mine from them.
https://www.amazon.com/dp/B0080L0FYC/ref=cm_sw_r_cp_apa_glt_fabc_JCXKQDZYPYC9ZZ1ZDRTM I know it's $185USD but it's definitely worth it. I've modified this same one onto a better clamp arm to my desk. The one it comes with in my opinion is garbage.