We have used several of the agencies below.  For hotel reservation in Europe, we have used Venere and Orbitz successfully on several occasions.  For hotel reservation in the USA, we have used Expedia, HotelmartUSA, and Orbitz successfully.  For condo renting, we have used Armed Forces Vacation Club, however, you must be active duty, retired military or government employee.  We have used SkyAuction several times with outstanding results.  We have used BJ's with very good results, you must be a BJ's member.