Cash only / in-person only. $200 per microscope stand.
Purchased at a business liquidation auction from a biotechnology company, I have 2 Aven brand dual-boom arm microscope stands for sale. They are slightly different cosmetically with only 1 being labeled but are identical in design, function, and quality. Just under 37lbs each (the heavy weight base is to prevent tip-over when extending the arm with your microscope head).
Price is for a single stand, I have 2 of these used models for sale as shown, I will also be listing 2 separately that are new in original boxes direct from Digikey. Check my other listings.
Fully articulating with high quality roller bearings for the dual boom slider, every joint is adjustable and lockable. These stands are currently equipped with a 1/4-20 screw mount which is the standard camera / AV mounting thread, meaning any high-end digital camera will mount to the attachment currently connected, but as they have a standard 16mm drop-in post receiver you can swap that for any standard T-19 mount (this type has a slightly less-than 16mm cylinder with a narrow / typically 15mm center portion for locking in the post).
With a T-19 mount, if you want to put on a standard 76mm microscope head it's as simple as loosening one screw, pulling the existing camera mount adapter (the 1/4-20 mount) and slotting in any other T-19 AKA 16mm end.
Example of a T-19 or 16mm mount for a standard 76mm microscope head: https://www.amazon.com/Microscope-Adjustable-Binocular-Trinocular-Accessories/dp/B0BQ1YYR2W (you can typically find these adapters on eBay for cheaper).