Snack Exchange - Poland <> US

So I am sending some snacks to my friend in Poland and I was wondering what US snacks are hard/ impossible to find in Polish stores. And what may be expensive US candy there? I heard that I shouldn't send Hershey's but any other tips would be greatly appreciated.

I think you cannot go wrong with the big packs of M&M (almond, peanuts), suggested to buy in Costco plus all the other typical American stuff like Sneakers, Mars, maybe brand coffee like Dunkin etc.

Thanks! I'll get some special m&Ms to try and get something that's exclusive to the US. And I'll definitely try those other candies too.