Came across these earlier in my local Poundland - Trongate, Glasgow.
This store has Twister, Split, Starship 4, Calippo (orange and lemon lime) varieties in cardboard strip packs but looks like there's more out there, from Googling, such as Funny Feet, Feast and Mini Milk (different flavours - chocolate, milk, strawberry).
Great for stockings (if you're like me and plan Xmas early!).
Picture of items and receipt in Post #1.