a couple of tours, Keys to the Kingdom and Family Magic Tour. Both were well worth it but I doubt the second is anything you would be interested in. Most of the tours are worth the time and money if it is an area you're interested in.
Here are a couple of links that might help. The first has a general description of the tour and the second has some reviews of the tours. The number of reviews varies widely.
http://allears.net/btp/tours.htm
http://land.allears.net/reviewpost/showcat.php?cat=66