Look for it in a health food shop. In the UK larger supermarkets also sell
it. Here is my quick and easy bulgar wheat recipe:

1 lb            Spinach
1 large         Spanish Onion
2 cloves        Garlic
1 pint          vegetable stock
1 teaspoon      salt
1 teaspoon      black pepper
2 cups          Bulgar Wheat
3 tablespoons   Olive Oil

Fry  the  finely  chopped  onion  and  the  minced garlic in the olive oil.
Meanwhile  cook  the bulgar wheat with the salt (only if needed) and pepper
in  the  stock till tender. Finely chop the spinach and add it to the fried
onions and garlic. Add the bulgar wheat. Simmer for about fifteen minutes.