There are also two excellent novels by Barker,
Man of Gold and
Flamesong . Both are on Amazon. Reading these will really give you a feel for the place.
Zottola Publishing is going to be releasing some new novels, as well, at least two of which star the young Priest of Thumis, Harsan, who appears in the first novels.
Prince of Skulls
Hársan, linguist and priest of the god of wisdom, is sent on a diplomatic mission beyond the frontiers of the Empire of the Petal Throne. He and his companions are caught in a skirmish with ferocious foes, both human and alien, and flee in an ancient underground tubeway car in order to save a spoiled and petulant N'lüss princess. Arriving in distant Ghatón, they discover a plan that could change the very future of Tékumel.
Lords of Tsámra
Korrúkka is part of a Tsolyáni political mission to find a peaceful solution to the war between the Livyáni and the people of the isolated Tsoléi Archipelago. After seeing the wonders and secrets of Holís Isle, the talks break down and the Tsolyáni delegation becomes mysteriously ill. Left to die from the fearsome Plague of the White Hand, the mission appears destined for an untimely end. Waking up on the shores of Livyánu, the remnants of the delegation must find a way to stop the spread of this deadly plague before it spreads and destroys all of civilization.
'A Death of Kings'
This novel continues the story of Hársan, as he voyages out to the Far Eastern coast of Salarvyá. The country is in chaos as various factions fight for power after the death of the '"Mad King," Griggatsétsa. Hársan and his companions struggle through the riot-torn streets of the capital, Tsatsayágga, and then on to distant Jækanta and obtains new insights into the mysterious College at the End of Time and the Unstraightened City.
Tita's House of Games also has hard-to-find and out-of-print Tekumel stuff you can't get elsewhere. And cheap!