Navy Bow-ties for Boys
If you're budget-restricted, your best bet is this Nordstrom Bow-tie. It's a great item, while not very pricey. Also consider this J.Crew Bow-tie. It's an item you're bound to love which also won't break the bank.
If you're looking at it like an investment piece, then you absolutely must check out this Ralph Lauren Bow-tie. This piece seems costly, but it's worth it.