The only ones I've seen in normal UK supermarkets are those two kinds. Apparently you can also get Choco-mallow(which I tried in America as 'Smores Flavour' and I thought tasted disgusting) and Cherry. I suppose you can get others in specialist shops that stock American foods.
I bought massive boxes of the "Hot Fudge Sundae" and "Strawberry Lemonade" and others that sound delicious, but I actually hated most of them and ended up throwing some away. They seem like they'll be lovely, but they're not at all.