In Wisconsin you will find all the ice creams known to mankind, but they don't deal in a variety of fruits.
I must disagree; the above sentence doesn't make sense, and is grammatically incorrect. It looks like somebody was stretching to find a way to use fruit and ice cream in the plural. Since they are uncountable nouns, the correct sentence would have to be:
In Wisconsin, you will find all the kinds of ice cream known to mankind, but the ice cream doesn't do business with fruits, so you'll have to be heterosexual if you want to buy any.