Web forums are quite popular. You can also contact a microscope dealer or manufacturer. You can try to contact the head of the biology department of a school. He or she might tell you where the microscopes were bought, should the school own a few. I recommend the following:
- Vead this Beginner’s Guide to Microscopy, which you are reading now.
- Visit the forum
- Buy books
- Directly contact the biology department of a school or university.
- Microscopy clubs