I used to not consider myself a big podcast person. While everyone else was hopping on the Serial train I was calling NPR like “Can I just hear some Justin Beiber?” But since writing about the best personal finance podcasts for millennials three years ago, I've become a podcast pro in my own right. This article started as a list of podcasts I wanted to try to save my readers the trial and error of finding them on their own and has led to me starting my own podcast about frugality with my friend Jill. It's called Frugal Friends Podcast and…