Hey, for Miracle Noodles, check in the refrigerated sections, with the produce and pre-bagged greens. That's where I find mine.
Mandarins are amazing, and only about 30-35 calories each.
Small stone fruits, too, like plums or nectarines, are really low calorie. Cherries are only 5 cal each average.
Melon! 100 g of cantaloupe is 35 cal, 100 g of watermelon is 30 cal, 100 g of honeydew is 36 cal.
Raw vegetables are obviously low, but radishes are a favorite snack for me. They're only 1 calorie apiece, average. Cabbage is really low calorie, too. I use it as a substitute for noodles in soups. 100 g of shredded cabbage is 25 cal.
A cup of air popped popcorn is only 30-35 calories. I put garlic salt and a bit of spray butter on mine, or sometimes powdered splenda and cinnamon.
Broth. I love broth. I have days where I just live on this and nothing else.
For meals, I really like tuna and crackers right now. Five whole grain crackers and 4 oz of canned tuna is only a couple of hundred calories, plus a lot of protein. I add a little bit of pickle to mine, and black pepper. 200 is a lot at once for some people, I know, but keeps me full for a long time, and looks like a normal amount of food in front of roommates, especially if I throw some steamed broccoli on the side.
I'll be back when I think of more, lol.