If you're a thrifty shopper, this Bow-tie will fit the bill. It's a fail-safe choice, while not very expensive.
If you can afford to spend a little more, look no further than this Lanvin Bow-tie. This item doesn't cost a fortune, but absolutely indispensable in your wardrobe. Why not also look at this Saint Laurent Bow-tie. It's an attractive option both price and quality-wise.