This is a listing of the Chestnut Growers of America, 2021.
I'm pretty sure you can contact them to find out which retailers in your area carry them. The Chinese chestnuts definitely are not suited for candying, apparently the flesh is too dense to absorb the syrup.
I had excellent results with imports from Italy, from Turkey and the California "colossal" variety and I think growers in other states produce this type, Washington state and Idaho. Those are the only ones I actually tried.