This is the company that we used:
http://www.jerkwater.com/The BLACK CANYON trip is the fun one. With taxes and 10 day deposit discount it is about $75 a person(10 people required). They give you the canoes, paddles, and lifejackets. It's basically like a backpacking trip with food and shelter and you can camp anywhere along the river. When we did it 9 years ago it was fun but we traveled too far each day and did not get to spend time exporeing the terrain on the sides of the river. If I were to do it again I would want to allow more time as to enjoy the paddle trip.