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.
Tesla Model 3/Y Sportscar Style Seat Ventilated Cushion (Full seats)
"Upgrade Your Tesla Experience with Sportscar-Style Ventilated Cushion Full Seats | TeslaSY.com Elevate your comfort and style in your Tesla Model 3, Y, or S with our premium ventilated cushion full seats. Enjoy the ultimate driving experience with breathable luxury. Order now!
www.teslasy.com