If you have the key number there are a lot of places on Amazon and Ebay plus some businesses. Check more than one because some sell multiples with no extra shipping or at lower prices for the identical key.
And you know you will lose another one if you don't buy extras.
2017 SLX 195RB
2014 Jeep Grand Cherokee Overland, gas 3.7 V6
Andersen WDH hitch
Dometic Milenco Aero mirrors