Some time ago Beast Kingdom released their Egg Attack floating Millennium Falcon. It’s a nice little thing, if a little expensive, but the floating feature makes a nice talking point for anyone that hasn’t seem it before. They are now releasing a version for Episode VIII; The Last Jedi with an Ahch-To base to float on.
Due for release in July 2018, it retails for about £250.
I have both the regular and the chrome versions of the Original Trilogy Falcon, so I might just get this version as well. The inclusion of landing gear is a really nice touch IMO.