Kit Kat BLUEBERRY MUFFIN is on sale at Amazon (USA) for $19.94 box of 24 from a third party but Amazon shipped unfortunately they don't ship very good (product box shipped in paper bag) and my box inside the bag was tore up but each bar seemed fine and undamaged.
Also they also have the KIT KAT Chocolate Donut on sale (which I never tried) box of 24 for $21.29! and this is Amazon-Amazon shipped and sold so I got both