http://www.bajabydesign.com/double-down-dream-hunts.aspx
Try contacting, wildlife advisory services---213-385-9311, mexicoadvisoryservices.com
Also theres a forum thats pretty active with the older crowd of Baja junkies called www.bajanomad.com there is some hear say on there and some of it may not be current but there is talk that its very difficult to make it happen.
For example: http://bid.wildsheepfoundation.org/5-DAY-BAJA-MULE-DEER-HUNT-FOR-1-HUNTER_i15298518 gives you just an idea on the base price you might be dealing with.