There $1,189.00 for all 4, so pretty comparable to T-Sportline. They also have a ventilated option which i've never seen before.
https://www.teslasy.com/products/tesla-model-3-y-sportscar-style-seat-ventilated-cushion-full-seats?variant=92165c88-b364-46b0-99b3-8469ed70ffec