I once had an "emergency" tire swap done at Ride Now Powersports on Sahara. They did quick work and were CHEAP. At the time they didn't charge for the installation if you purchased the tires from them and had them put on during the same visit. On top of that, they had a sale on the Pilot Road tires that I bought so I got out the door for under $240 for both tires installed. Good folks.
That was well over a year ago, so there is no guarantee that you'll get the same deal but it might be worth a shot.
With that said, if you're looking for tires "near" Las Vegas I can get you a smokin' deal at a local shop I frequent. PM me if you want details and are willing to get tires 180 miles southwest of LV.