The price varies but looks like it is about the same price as a supercharger. I could have sworn they were quite a bit cheaper...but I also looked at it over a year ago. Damn time flies!
. You'll have to find a local dealer and ask them. Just look up STS, they have an F150 package and a dealer list.
I would look into new gears and maybe the e-fans and under drive pulleys. Much cheaper and they help a bit.