Rumbles of Thunder

/way 40.2 40.6 Lei Shen
/way 47.0 59.9 The Sacred Mount
/way 34.9 65.6 Unity at a Price
/way 60.7 68.8 The Pandaren Problem

There seems to be a lot of conflicting information here on when you can get each lore piece. This is mostly likely caused by conflicting PTR and post-release information, and it made the process of finding them a little awkward for me during Stage 3.

Here are my screenshots clarifying locations up to and including Stage 6:

Rumbles of Thunder

[Stage 1] Unity at a Price
[Stage 1] The Sacred Mount
[Stage 2] Lei Shen
[Stage 2] The Pandaren Problem

Gods and Monsters

[Stage 1] Agents of Order
[Stage 4] The Curse and the Silence
[Stage 4] Shadow, Storm, and Stone
[Stage 6] Age of a Hundred Kings

The Zandalari Prophecy

[Stage 1] Coming of Age
[Stage 1] Shadows of the Loa
[Stage 3] The Dark Prophet Zul
[Stage 5] For Council and King - There are some phasing issues with the Zandalari Warship. Be persistent, you'll have a lucky day where the ship is docked and remains phased in.

From these, I've made this map of all Thunder Isle lore.

Lei Shen - Found at the Dawnseeker Promontory on the Isle of Thunder @ 40.2, 40.6

The Sacred Mount - Found in the central building of the Diremoor on the Isle of Thunder @ 47.0, 59.9

Unity at a Price - Found in the Hall of the Grand Imperion in the Court of Bones on the Isle of Thunder @ 34.9, 65.6

The Pandaren Problem - Found at the Violet Rise on the Isle of Thunder @ 60.7, 68.8