LC veg snack!
 

Try flavoured nori (seaweed pressed into sheets)!
It is thin and crispy and comes in convenient pre-cut foil packs.
The type I buy had this nutritional info:

Ingredients: seaweed, salt, rapeseed oil, sesame oil.
Serving size 0.07oz./2.1g
Calories 10
Total fat 0.5g
Saturated fat 0.3g
Cholesterol 0.0g
Sodium 74.3mg
Total carbs 0.8g
Fiber 0.04g
Sugars 0.03g
Protien 0.53g
It also has vit. A, C, calcium, and iron (small amounts)

This is Korean nori, BTW, which traditionally has sesame oil. Japanese nori also comes flavoured, just watch out for sugar (like in the teriyaki kind.) Check labels!

For anyone in the southern UK, I found it easily in New Malden (my fav store is Intel) which has a large Korean community.