Right now it's hard, but I know a few tricks.
First, there are subreddits specifically on the topic.
https://www.reddit.com/r/FreeEBOOKS/
https://www.reddit.com/r/KindleFreebies/
https://www.reddit.com/r/ebookdeals/
Ereaderiq does a query of free titles: https://www.ereaderiq.com/freebies/ (I actually created a bookmark on the site to filter the results somewhat).
Smashwords has a great way to filter results by price, and of course, they let you price ebooks at free. More importantly, it lets you filter by word count as well. I use this: https://www.smashwords.com/books/category/57/newest/0/.99/medium
A few months ago I did a huge blogpost during Ebook week of all the high quality ebook titles temporarily on sale at Smashwords for that week. Man I made out like a bandit then.
I used to check the Amazon Top 100 Free for the genres that interest me. But that's time consuming, full of public domain titles and often very short stuff. I just checked today and found a few gems. (I guess I should start doing this again -- just to see what's out there. I'll do it for 60 days). I'm sure the Poetry Free 100 should produce a few gems.
On average, I find about 50 or so free ebooks each week. I am totally a cheapskate, but I'm getting used to the idea of buying many intriguing but obscure titles in the $1-2 range. I'm still reeling from the discovery a few weeks ago that the Donald Harington 3 volume of collected works are priced at 1.49 for the first two volumes. That's unbelievable!
The ebook deal newsletters provides several free titles, but the titles don't seem particularly interesting to me. Lately, there have been no free titles from these newsletters that have struck me.
Finally, goodreads has a thread asking people to report free titles to amazon so they will price match to free. https://www.goodreads.com/topic/show/1656885-price-matching-to-free-on-amazon?page=2
It seems that your comment contains 1 or more links that are hard to tap for mobile users. I will extend those so they're easier for our sausage fingers to click!
Here is link number 1 - Previous text " a"
^Please ^PM ^/u/eganwall ^with ^issues ^or ^feedback! ^| ^Delete