If you'd rather not spend much, this Emporio Armani Bow-tie will fit the bill. It's a fail-safe choice, while not very pricey. Another strong contender for your wardrobe is this Lanvin Bow-tie. While the price of this piece is competitive, it will surely attract a lot of attention. Or you can choose this Adam Kimmel Bow-tie - be sure you'll be making a stylish addition to your wardrobe.
If you have enough to afford it, then what you're looking for is this Saint Laurent Bow-tie. It's more expensive but worth your money. While you're at it, also have a look at this Chanel Bow-tie. Yes, this item is expensive, but it does not mean it's not worth it.