Black Wool Hats from STYLEBOP.com
If you're budget-restricted, your best bet is this The Kooples Hat. It's a great product, while not very expensive.
If you're looking for a good deal, you're in luck with this Zadig & Voltaire Hat in stock and waiting for you. You are bound to love this item.
If you're not the one to skimp on clothes, then you absolutely must check out this Valentino Hat. This item seems pricey, but it's worth it.