Bread and Tortillas
A lot of bread and tortillas have added fiber these days - some tortillas have up to 12 grams of fiber per tortilla, and only about 100 - 140 calories. The "Dave's Killer Bread" brand of bread has up to 6 g of fiber per slice. It is very filling.
Oh, and Kashi cereal also has a lot of fiber - I think about 9 grams per serving, and it's really yummy.