I just found out that there is another free digital DC Comics issue now available: "Superman's Pal Jimmy Olsen #148".
You can download it for free now from Amazon's Kindle Store or Comixology.com !
Here's the cover:
And the link to Amazon:
https://www.amazon.com/Supermans-Pal-Jimmy-Olsen-1954-1974-ebook/dp/B078Z1WF45/ref=sr_1_3?s=digital-text&ie=UTF8&qid=1548481636&sr=1-3&keywords=jimmy+olsen