I got two 10's under my seat, I got off of ebay for like $40. Cheap? Yes, but sound great! They hit hard, they are 450 watts, and I have a 650 watt amp pushing them. As the box goes, you spend your money on what you want, but you can make one for less than $30. Look at the pic of mine in my gallery, I made it my self. Right now I have two box's, but I am going to make just one whole box later.