Its found in free range animal meat (more expensive then conventional factory farmed meat) or you can eat Natto which is a Japanese fermented soybeans which to many have an unpleasant taste (this is MK7). Some types of cheese also have MK7. MK4 is found in a few other foods but the high concentration ones are rather exotic like Goose liver pate or Emu oil.
You can also buy it in tablet or drops. There are two forms, MK7 found in some cheeses and Natto and MK4 found in animals. MK7 does some of the same things as MK4 such as activating osteocalcin and maybe matrix GLA protein and maybe some others while MK4 does these plus many more, some involving the immune system and is stored by the brain, pancreas, liver and a few other places unlike MK7.