Reddit reviews The Letters of J.R.R. Tolkien

It depends. That's definitely the order you should read them in, but if you're asking for chronological order it would be The Silmarillion, The Hobbit, and then The Lord of the Rings. The Unfinished Tales doesn't really have a spot in the chronology because it contains different stories that take place at wildly varying times.

Also, a couple of quick sidenotes. Since you at least seem pretty invested in the wider lore, make sure you don't skip the Appendices found in The Return of the King. They contain a lot of worthwhile information. Also, I would highly recommend reading The Letters of J.R.R Tolkien by Humphrey Carpenter in between The Lord of the Rings and The Silmarillion. It's an excellent book and contains a tremendous wealth of information relayed straight from the Author's pen.

https://www.amazon.com/dp/B00I7JFCAY/ref=dp-kindle-redirect?_encoding=UTF8&btkr=1

The Letters of J. R. R. Tolkien.

Here!

Well since no one else has taken you up on this...
I was not able to find much for .99 but here are three (all under 3.00), any of which I would very much enjoy if you feel so inclined and are willing to change your 99 cent policy haha!
The Golem and the Jinni,
Tolkien's Letters, and/or
The City Stained Red.
Thanks for your kind consideration!