That doesnt sound good. Sorry to hear about it.
Well, before was it cracked or was there a good size rock chip?
Another possibility (which i honestly doubt!) is someone tried to shoot you when you were getting out of your car and missed and hit your window. JK
Anyway, yes you can buy a used window at junk yard. Potomac has a lot of stuff, there is tri star pete, adsit, etc. I dont know the cost of new vs used window for your car.
You need to take the door skin off to change the window. Just make sure you vaccum really really good, otherwise you might cut yourself trying to install the new window.