Microphones are important, here are some of the links you can consider for the microphones. They are important as they enhance your audio experience for your students. Highly recommend using USB connected microphones. Here are some examples

1. Portable Mini Clip-on Omni-Directional Stereo USB Mic Microphone
2. USB condenser Microphone Metal Cardioid Recording Microphone

Wacom tablet allows you to annotate on your devices to make your teaching much more interactive in many ways. Here are some possible links to purchase the wacom tablets.

1. Wacom Intuos S (CTL-4100) Graphic Drawing Pen Tablet
2. One by Wacom Small (CTL-472) Graphic Drawing Pen Tablet

Additional Monitors give you the edge by allowing you the separate a screen for teaching and another one for seeing the comments and questions that come in the chat function.

1. Acer 21.5 Inch Monitor
2. Refurbished Monitors