This popped up on google while researching revisions to my beacon comparison chart:
http://www.evogear.com/item_5442.aspx?CMP=KAC-gbase
[Many other multi-antenna models now have better features for difficult multi-burial searches, but the Tracker is still the easiest & fastest for a shallow single burial.]
For those needing to buy the entire trinity, some good package deals:
http://www.snowbigdeal.com/servlet/StoreFront
http://www.bentgate.net/avypkg.html
http://www.avalanchetools.com/
Also, EMS.com will have the Tracker for $240 during the 20% off "Club Day" Oct 20-22, as well as some good shovel & probe deals at the same discount.