I never priced the flowers in the conservatory in either the Millie or Infinity but have ordered the Bon Voyage dozen long stem roses numerous times and they have been superb each time. My wife is a teacher and teaches the 6 week summer school so we often cruise in mid August, and it's our honeymoon. I order through Celebrity's Bon Voyage gift so they are in the cabin often on boarding or at least 2-3 hours after. They have been extremely nice, well presented and last all of the cruise. It dresses up the cabin!! We are sailing on the Millie 11 day next Monday, Aug 12 and I had already ordered then at $55 a dozen.
The Bon Voyage flowers are not too overpriced. I work in a flower shop in Mid- MIchigan, and our roses are $50 a dozen. They are probably more than $55 in most major cities. I've purchased the tropical arrangement, it was very nice, and lasted most of an 11 day cruise.