The only Tesla OEM 19” that has a prayer of getting 50,000 miles is the Michelin Primacy MXM-4. In fact, I got in the mid-50Ks with that set and could easily have gotten 60K out of them. Not bad for a 45K warranted tire.
The maximum I’ve heard of the original Goodyear OEM (Goodyear Eagle RS-A2) getting is 34K, with a single unverified report of 38K. Mine were maybe 1/3 done at 10K miles.
Have heard zero reports of anyone getting 40K with the new Goodyear Eagle Touring (TE) tires. I doubt I’ll get 27K out of mine. All of that said, today I was quoted over $900 not including mounting/balancing for a new set.
So I’d agree - the OP’s price for 100-mile GETs is more than fair and offers an opportunity to judge for yourself how quiet these foam-enhanced tires are compared to whatever you’ve got now.
My own $0.02 is that the GETs haven’t gotten nearly as loud as the Michelins did as they get down to and past 4/32”. So that’s a win if tire noise drives you nuts.