Yeah you can buy them from the supermarket sometimes there in a funny section like baking or bread so require a hunt!! But you don't have to have a popcorn maker u can do it in a saucepan x
:hmm:Hmmmm...the 5.5 syns is for 28g of plain popped popcorn.
However, popcorn loses weight when it pops, so you could be having more of it for your syns....I think LOL
From google:
Popcorn pops because the small amount of water in the kernel vaporizes as it heats up. The resulting popped corn weighs less than the original kernel because the weight of the water is no longer in it.