umm.. i think any lacto-fermented veggies like kimchi, pickles, sauerkraut, daikon will hook you up right quick if you can not get natto. chicken/chicken livers and ground beef, cheese - i think both hard and soft, egg yolks. not as high but easy to get would be any dark greens such as broccoli, spinach, kale. i know I am missing a few things but I am sure someone will post them.