Single travelers are often hit with a "single supplement" to the base price. To avoid it, you can agree to room with other single travelers on the trip, or you can find a compatible roommate before you go from one of the many roommate-locator agencies.
Travel Buddies Singles Travel Club (tel. 800/998-9099; www.travelbuddiesworldwide.com), based in Canada, runs small, intimate, single-friendly group trips and will match you with a roommate free of charge and save you the cost of single supplements. TravelChums (tel. 212/787-2621; www.travelchums.com) is an Internet-only travel companion matching service with elements of an online personals-type site, hosted by the respected New York-based Shaw Guides travel service.
For more information, check out Eleanor Berman's latest edition of Traveling Solo: Advice and Ideas for More Than 250 Great Vacations, a guide with advice on traveling alone, whether you're on your own or on a group tour.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.