Before reading my report on it, know it wasn't a happy report. DS's hair was too long to spike without looking silly, I was having reactions to it which were feeding DS's reactions (I realize this now), and it just took way too long. They will slick the hair back, if you don't want it spiked, but all the spiking had taken so long we coudn't seem to get ourselves together to reverse course.
I've forgotten the $ details, but allears says "Knight Package: (for boys) includes a hairstyle with colored gel and a shield and sword. $12.95."
My guy was happy to be in there when he was 4 (I think that's the birthday we did it for), but at 8 I doubt he'd want to set foot in the girly environment. Sigh. So take your son's age and temperament into account!