If you're not planning on spending much, this Jack Daniels Cap will fit the bill. It's a fail-safe choice, while not very pricey. Another nice option is this O'Neill Baseball Cap. While the price is rather reasonable, be sure that this piece will become a wonderful addition to your wardrobe.
If you can afford to spend a little more, we recommend taking a look at this Patagonia Cap. While the price is very reasonable, this product is an easy wardrobe update. It's also worth checking out this Jack Daniels Cap. This product is extremely popular and, just as importantly, not too pricey.