Snack a jacks do bags of salted popcorn (they are real popcorn- nothing to do with rice cake things)
They are only 2.5 syns a bag- I take 4 bags in to the cinema with me and have a right good chow!
If you fancy something sweet, mikado biscuits are only half a syn each so you can eat a full box of them and still have syns left over!
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