The Swift SW380T is a trinocular microscope and I can give it a good recommendation, also because of its affordable price.
The Omano OM36 microscope comes in a binocular or trinocular version. It is the brand of the company microscope.com
General-purpose DSLR Adapter
Review of a no-name DSLR adapter for microscopes.
Microscope Camera (5MP)
Review of a 5 megapixel USB 2 microscope camera.
Review: Zoom Stereo Microscope
SZM Series Zoom Stereo Microscope
Review: A low-cost introductory microscope for kids but also for those who want to try out microscopy.
Having a closer look at the Omano Junior Scope, a children's microscope, but not a toy.