I'm new to carnival (well kind of new, last time I was on a carnival ship was the glory in 2008 i think), so forgive my ignorance here, but are there a "limited" amount of Cheers packages available? Can they sell out? I only ask because I have a Mardi Gras cruise in January and I haven't purchased mine yet and was wondering if I should go ahead and do it or if I could wait a bit longer. Thank you!