JL sub box for an 09 Alpha
 

I am looking at getting one... Anyone have one for cheap?

why dont you make one? it's not that hard?when you make it fill the interior with poly fill it'll sound better, i made one for my van so it fits nicely against the wall, i had the radio boys install they even said it was nice, ive made some real killer boxes when i had my iroc, those days are gone lol.

i have 2 6x9 and 2 12's and two factory speakers and its plenty loud enough imo