I don’t think the rest of the podcasts have been uploaded as yet.
There is no paywall on the podcasts; they are all free. The third one will come out on about June 1 2018. There will be at last eight podcasts and they're coming out at a rate of one a week because the investigating journalist is reacting to incoming information in real time.
You can subscribe free to the podcasts by going to iTunes or just go to the website theteacherspet.com.