First of all....Welcome to the Cisco Learning Network!
Regarding your question of e-learning.training for CCNA Cloud, it is a higher price because it come with all the learning objectives and practice labs that you need to prepare for your certification exam. The study guide book makes reference to the Exam Topics and its a good compliment to your studies. As you stated, both are good learning material since they come from the same author. They complement each other. Both give you the knowledge you need, but remember that job experience is what will help you solidify your knowledge.
Also allow me to share with you the complete e-learning options for CCNA Cloud available for you here at the Cisco Learning Network:
For an overview of the Cisco CCNA Cloud Certification, you can read the following link:
Also if you need the Exam Topics, and would like to review FREE Study Material and Practice for each exam you can check the following links:
You may want to check the Official Exam Tutorial, so you are aware of the type of questions you will encounter in both exams:
Finally, you might want to check out a very well written blog by the Cisco Certs & Labs Team regarding the CCNA Cloud certification with great insights including a video with valuable information for you. You can read the blog and watch the video at the following link:
I hope this information is helpful for you and I wish you all the best in your CCNA Cloud studies.