If you're in a thrifty mode, your best bet is this Marc Jacobs Brooch. It's a popular item, while not very pricey. Another great option is this Simone Rocha Brooch. While the price is rather reasonable, be sure that this item will become an excellent addition to your wardrobe.
If you can afford to spend a little more, you're in luck with this Marc Jacobs Brooch in stock and waiting for you. You are bound to fall in love with this product.
If you can afford to splurge, then you absolutely must check out this Maison Margiela Brooch. This product seems expensive, but it's well worth it.