The Nautilus Explorer, an excellent live-aboard
dive boat that covers British Columbia in the summer
– we gave them a good review in October 2004
– and visits Mexico’s Socorro Island in the winter,
voyages to Guadalupe in September and October.
The owner/captain, Mike Lever, says on his website:
“While our past white shark sightings have been
excellent and continuous all day long, these are wild
animals and there is no guarantee that all future
trips will have the same number of sightings.” Prices
for either a four night or five night trip run $2150,
$2550 or $2950 depending on whether you want
dormitory, stateroom or executive suite
accommodations. Phone 01-604-657-7614 or visit
www.nautilusexplorer.com
Lawrence Groth runs Great White Adventures  and says he has led more than 400 great white trips
  since 1998. He uses the Searcher, but also runs “luxury
  trips” on the Solmar V, a good live-aboard that
  normally runs out of Cabo San Lucas. It’s $2595 for
  Searcher trips. Solmar trips run $2895 for five days
  and there’s a seven-day trip for $4195. They offer
  certified divers the rush of being lowered 25 feet
  in their topless, submersible two person cage. Want
  that “open water” thrill sitting on top of the cage
  with circling great whites? The Solmar trip includes
  a night in a basic San Diego hotel and a two-hour
  bus ride to Ensenada, which shortens the boat ride.
  www.greatwhiteadventures.com or 866-352-7075  
San Diego Shark Diving Expeditions, run by
  “Doc” Paul Anes, visits Guadalupe Island on two different
  craft normally used in California diving. The
  Horizon has eight cabins with open berthing and
  daily room make-up. The Odyssey has one carpeted
  air-conditioned berth room with daily room makeup.
  Both boats have two shared restrooms with hot
  showers and the Odyssey has a hot water deck shower.
  Five-day trips on either boat are $2550. Anes also
  charters the Nautilus Explorer. www.sdsharkdiving.com or 1-888-SD-SHARK