Hi - while in Athens this June, we're planning to take the "3-day Classical Tour" on coach, including Olympia and Delphi. I'm seeing some early-booking discounts on various sites (up to 20% off the retail price of 360e, first class, when booked till end-March). The hotel tells me they can book this tour for me once I check in, but with only a few days left for the tour, will I still get a discounted price? Or is it better to book directly in advance paying in full? Any advise, experts?