If you're not planning on spending much, consider this '47 Cap. It's a popular item for a reasonable price. Another strong contender for your wardrobe is this Patagonia Cap. While the price of this product is rather reasonable, it will definitely attract a lot of attention. You might also want to consider this Life is Good Baseball Cap. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're a bargain shopper, look no further than this J.Crew Baseball Cap. This item doesn't cost the earth, but absolutely deserves a spot in your wardrobe. It's also worth checking out this Woolrich Baseball Cap. This product is extremely popular and, just as importantly, not very expensive. And do check out this Cap! It's a very popular item and good value for money.