Well $445 is nothing in contrast to what you can make if all this knowledge is put into effect. I would definitely recommend SOLID principles above others.
Well yes, $445 can relatively be a lot of money, however, in times of globalisation and developers being in high demand one just has to think outside the box a bit and join a company remotely if possible. I'm not saying it's easy, but can be done.
While I don't disagree that Bob Martin presents useful information in those videos, his presentation style is... bizarre to say the least.
You'll find as you watch them that the signal-to-noise ratio drops with each episode. In the last few, there's about ten minutes of useful information mixed in with about 50 minutes of cosmology lessons, tours of his house and neighbourhood, and babble amongst his various alter egos (Data, Sherlock, Spock, Minecraft guy, Ruby guy, Microsoft fanboy, and so on).
Everyone has their own threshold for how much of that they can tolerate. For me, it crossed that about five episodes ago.
My memory's a bit foggy about what's in each one and how much of an acid trip they all are, but I'd say episodes 6-14 are kind of the sweet spot you're looking for. The next several, from 15-19 cover some good stuff but are getting really wacky, and beyond that could be good if they weren't so damned weird.
Geez! That guy on the thumbnail for the first video (Clean Code - The Last Programming Language) looks really angry. I don't think I want to learn anything from that.