Tackett

ok I feel like a 'tard asking this but: Ive decided to pick up a RE 12sx sub but I am confused about how to buy the thing. Do i just email them and tell them I want one or what? Also does anyone know the round about price and mounting depth for the XXX? It probably wont fit in my box, but I would still like to know. I wish they would make a simpler way of purchasing their products...