If you are on a tight budget, this Musto Baseball Cap will fit the bill. It's a great choice, while not very costly. Another strong contender for your wardrobe is this Collection XIIX Cap. While the price of this piece is not too high, it will certainly attract a lot of attention.
If you're looking for something in between pricewise, check out this New Era Cap. While the price is very reasonable, this piece is an easy wardrobe update. You might also be interested in this New Era Baseball Cap. It's an attractive option both price and quality-wise.