Yes, on the 18" WSM, that's a good
price. If it's a 22" WSM, you stole it from them.
I think that the foil is to help with the cleaning. You pull the greasy foil off and throw it away.
Have fun with your new toy, and cook yourself some good food. Don't forget though, there's some people around here that won't believe anything that you type if you don't take pictures and post them. Not saying that I won't believe you, but it sure keeps me from guessing.