At 1900 miles, you'll only need to replace one tire.
Make sure the new tire is IDENTICAL to the other three. Ask the shop to measure the tread wear on the other tires, and to shave the new tire if the difference is outside the limits allowed. I think at 1900 miles, you won't even need to shave it.
If the tire replacement shop gives you a strange look when you ask them to consider shaving the tire, you're in the wrong tire shop. Put the donut spare on and go somewhere else.
If the tire replacement shop tells you that it's not possible to get an identical match for the tire, then again you're in the wrong place. Put the donut spare on and drive to the dealer.
Actually, it may be worth going to the dealer anyway; there may be some sort of warranty in place on the tires for a short while, or they may give you a goodwill benefit and cut you a deal on that new tire.