These are a bit long in the tooth, but Shasta's nice.
http://www.sevencrown.com/houseboats/images/cascade.jpg
2007 Summer Rate May 25-28 (Memorial Day) & June 11 - Sept 3
3 day/2 night 4 day/3 night 7 day/6 night
$1050 $1350 $1750
2007 Value Rate Sept 5, 2006- June 10, 2007 & Sept 4 - Dec 31 (excludes Memorial Day, May 25-28)
3 day/2 night 4 day/3 night 7 day/6 night
$750 $950 $1250