"of each category" is correct and usable in written English.
For example, you could use it in the sentence, "The store had a wide selection of products of each category."
The winners of each category will receive a hamper from Ecover and a specially designed trophy.
You can see information about the contents of each category by clicking the Details button.
In this round of awards, it is noticeable how fluid the boundaries of each category can be.
The breakouts by category helped reinforce the regional variation and to look at the complexity of each category.
The winner of each category was awarded their prize of £2,500 in a ceremony in London.
After the winner of each category is selected, the judges have to find an overall winner.
Art advisers say their clients want only the best of each category.
I identify paradigms of each category.
MAC behavior of each category is discussed.
The advantages and shortcomings of each category will be covered.
Examples of each category are examined for their daylighting efficiencies.
