Starting in 04, the bolt on body kits are an factory option. Price is around 900-1000 dollars. However, rear spoiler is an factory option now, whereas it came standard on an SE before.
I'm kinda not sure about these kits, they are bolted on, with little gaps evident between the body and the kit, and I looked at them up close at a dealer, but I don't think I want to put those on while driving in winter weather. Salt can get inside and start eating the body between the kit and the actual body. (Not the front and rear bumper, those are plastic)
Of course, if you ask the dealer, they'll tell you that it's fine. They wanna squeeze more money out of you no matter what. What do they care.