Don’t you hate it when your yacht is just too big? A source tells Page Six that Jeff Bezos is quietly shopping his $500 million floating palace, Koru — because it’s just too huge to manage.  The jaw-dropping vessel also has a $75 million support ship, Abeona, though it is unclear if this is part of the deal. According to reports, it cost $30 million per year to operate the two ships together. (Not that that’s a burden for the 250 Billion Dollar Man, but it may make buyers scarce). Jeff Bezos is trying to sell his superyacht, Koru, a source tells Page Six. Getty Images for The Met Museum/Vogue We hear Koru — which features a wooden sculpture of Bezos’ wife Lauren Sanchez as a mermaid on the prow — has become too recognizable for the Amazon billionaire. The ship, our source notes, is equipped with water cannons, which are meant to ward off pirates, but would probably also be useful for blasting paparazzi.…