Walmart. $20 will get you a canner WITH a lid and a rack that can be used for pints and quarts.
Did the jar bump the side or another can when you were taking it out of the canner?
This is quite easy to do, and when the jars are this hot anything really can set them off. Even a stiff wind, no really. I used to can outdoors when I was using a turkey fryer burner. Yeah don't do that.