Interesting! Cruises Only sent an e-mail about a sale on Princess Cruises. I saw one that looked interesting, so just for the fun of it, I submitted a price request based on a single passenger. I expected the price to come back at 200%, typical of a single supplement. Instead, the price for one person came back at 240%. In other words, not only were they not offering a break on the single supplement, but they weren't even offering the sale price for that cruise for one person.