Review on Koolertron Portable USB Microscope Stand - Adjustable Manual Focus, Aluminum Alloy Holder for Digital Microscopes with Up and Down Adjustment Support by Teresa Thompson

No assembly instructions. This probably isn't an issue if you're the kind of person who buys a naked microscope stand, but it's worth noting. Build quality isn't great (a lot of play in the rack and pinion assembly) but way better than what you'd expect for $25, and everything is made of nice solid aluminum. Add a plug-in USB digital microscope to this stand (wrapped around the scope with some tape so it fits snugly on the stand-up collar) and you have a 200x zoom digital scope for about $60.