201 Recommendations for Study

As far as I'm aware, the study guide was discontinued due to the time/resource constraints with keeping it up-to-date. These are quite nice though; https://www.f5books.eu/ and as you mentioned, the blueprint itself is a great place to start. 

A while ago, I've written some articles about the exam process and how to to prepare for it, maybe there are some more useful tips in there; https://community.f5.com/t5/tag/series-f5-certification-mega-meta-series/tg-p/board-id/TechnicalArticles

And a specific one about study resources; https://community.f5.com/t5/technical-articles/f5-certifications-mega-meta-series-the-art-of-knowing-what-you/ta-p/284975 

Hope this helps, 

Alex