http://www.edmunds.com/used/2005/hummer/index.html
...for info on used pricing
http://www.hummer.com/
...to "build" a new one and check prices as such.
Good luck!
'05 adv. model (with sunroof, XM, Nav.) under "employee pricing was 53k in July, if that helps... almost 7k off sticker, then.