Depends on where you purchase the exam from, some of your online resources such as Linux Academy can point you to the right place, but you can shop around and find cheaper prices (just make sure its reputable). Proctored exam is having the proctor install remote software on your computer to watch you via your webcam & microphone(use a laptop) to ensure you're not cheating and you sit it online anywhere in the world really, so its pretty convenient.
I see, that is convenient. What exactly should I be googling to find places that offer this Proctered exam? My google results seem to indicate it can be done through Microsoft itself and another one being Pearson VUE. Are they among the more reputable ones?