If you're looking for an even easier & cheaper way to start experimenting with an Edge TPU, the $59 Coral USB Accelerator has been out for a while now: https://coral.ai/products/accelerator
Check out the Level Up series for getting started: https://www.youtube.com/watch?v=-RpNI4ZrfIM
And here's a fun real-life application: https://www.youtube.com/watch?v=jIyM_qT9RZw