Nikon LC-K101 Slip-On Front Lens Cap 4173 B&H Photo Video
Amazon.com : NIKON LC-72 72mm Nikon lens cap : Electronics
Foto&Tech 2 Pieces Center Pinch Snap-On Front Lens Cap Cover with Anti Lost String Compatible with Nikon, Sony, Fujifilm, Pentax, Panasonic, Olympus, Other DSLR Camera Lens (72mm) - Walmart.com
Nikon 1 LC-N40.5 Front Lens Cap, White at KEH Camera