Have not cruised the Med yet but is in our near future (2020?). When we do book cruises, we use CruCon. We have booked 12 cruises through them now and have always had great service. Since I like to do all my own research, they work well for me, always there to answer my questions. They also have offered great perks (on board credit, drink packages, gratuities paid...). You should find that the cruise price at any TA or OLTA will be the same as advertised on the cruise line's site. The difference will be the perks the agent offers. Good luck!