My own unapologetic opinions on books and writing.
It looks like they've got a good deal up there. In fact, all the volumes except the latest - 24- is on sale. If you've been waiting for a good price to try, or waiting for prices to drop on later volumes, now is the time to dive in or continue.
I'll probably abstain. I've gotten too many comics lately and am feeling overwhelmed. And while I loved this while I read it, I'm finding I can live without these.