I had hoped to find a list of all the tours somewhere. And I have not. So I will create one here. Prices are per person, except the VIP tours. I am not really sure if these are all the WDW tours, but these are all that I found. You can click on each tour name to go to the Disney web page about the tour.
Magic Kingdom Tours
The Magic Behind Our Steam Trains Tour - 3 hours - $40
Age Restrictions: Must be at least 10 years old to attend
Family Magic Tour - 2hours - $25
Keys to the Kingdom Tour - 4.5 to 5 hours - $58
Age Restrictions: Must be at least 16 years old to attend
VIP Tour Services - 5 hour minimum - $125 per hour
Mickey's Magical Milestones Tour - 2 hours - $25
EPCOT Tours
Backstage Magic - 7 hours - $199
Age Restrictions: Must be at least 16 years old to attend
The UnDISCOVERed Future World - 4 to 4.5 hours - $49
Age Restrictions: Must be at least 16 years old to attend
Seas Aqua Tour - 2.5 hours (30 minutes in water) - $100
Age Restrictions: Must be at least 8 years old to attend
Hidden Treasures of World Showcase - 3.5 hours - $59
Age Restrictions: Must be at least 16 years old to attend
Gardens of the World - 3 hours - $59
Age Restrictions: Must be at least 16 years old to attend
Epcot® DiveQuest - 3 hours (40 minutes in water) - $140
Age Restrictions: Must be at least 10 years old to attend
Dolphins in Depth - 3 hours in waist-deep water - $150
Age Restrictions: Must be at least 13 years old to attend
VIP Tour Services - 5 hour minimum - $125 per hour
Around the World at Epcot® - 2 hours - $80
Age Restrictions: Must be at least 16 years old to attend
Weight Restrictions: Must weigh 250 pounds or less [to ride a Segway]
Animal Kingdom Tours
Backstage Safari - 3 hours - $65
Age Restrictions: Must be at least 16 years old to attend
Wild By Design - 3 hours - $58
Age Restrictions: Must be at least 16 years old to attend
VIP Tour Services - 5 hour minimum - $125 per hour
MGM Studios Tours
There are no tours listed by Disney for MGM Studios.
Magic Kingdom Tours
The Magic Behind Our Steam Trains Tour - 3 hours - $40
Age Restrictions: Must be at least 10 years old to attend
Family Magic Tour - 2hours - $25
Keys to the Kingdom Tour - 4.5 to 5 hours - $58
Age Restrictions: Must be at least 16 years old to attend
VIP Tour Services - 5 hour minimum - $125 per hour
Mickey's Magical Milestones Tour - 2 hours - $25
EPCOT Tours
Backstage Magic - 7 hours - $199
Age Restrictions: Must be at least 16 years old to attend
The UnDISCOVERed Future World - 4 to 4.5 hours - $49
Age Restrictions: Must be at least 16 years old to attend
Seas Aqua Tour - 2.5 hours (30 minutes in water) - $100
Age Restrictions: Must be at least 8 years old to attend
Hidden Treasures of World Showcase - 3.5 hours - $59
Age Restrictions: Must be at least 16 years old to attend
Gardens of the World - 3 hours - $59
Age Restrictions: Must be at least 16 years old to attend
Epcot® DiveQuest - 3 hours (40 minutes in water) - $140
Age Restrictions: Must be at least 10 years old to attend
Dolphins in Depth - 3 hours in waist-deep water - $150
Age Restrictions: Must be at least 13 years old to attend
VIP Tour Services - 5 hour minimum - $125 per hour
Around the World at Epcot® - 2 hours - $80
Age Restrictions: Must be at least 16 years old to attend
Weight Restrictions: Must weigh 250 pounds or less [to ride a Segway]
Animal Kingdom Tours
Backstage Safari - 3 hours - $65
Age Restrictions: Must be at least 16 years old to attend
Wild By Design - 3 hours - $58
Age Restrictions: Must be at least 16 years old to attend
VIP Tour Services - 5 hour minimum - $125 per hour
MGM Studios Tours
There are no tours listed by Disney for MGM Studios.