No charge. You can also just ask your cabin stwewart.
SS Norway (12 times) '85 - '97; Radiance OS 06/01; Island Princess 11/04, Grand Princess 11/04/05, Golden Princess 7/21/06, Golden Princess 2/24/07, Explorer of the Seas 12/23/07, Island Princess 11/15/08
Yes, that's what they're called and there's no charge. We've always been very comfortable in the Princess beds, but we like a firm bed. If you're going to ask for an egg crate you need to ask your Room Steward for it as soon as you meet him/her. They do run out.
"A truly happy person is one who can enjoy the scenery on a detour."
Just asked my steward on the Emerald last November as soon as I got on board. They're foam with indentations that look like you could put eggs in them - i.e. "egg crates" and bigger than chicken eggs ... I found them very comfortable.
I cruise the Emerald Princess, Eastern Caribbean on April 16, 2012
my last bed n the Tahitian Princess was so bad I asked for a new one which they came up with a couple days into the trip.
They did not offer me an egg crate but I would expect there would be NO charge for it.