Baseball Caps from Sierra Trading Post
If you're looking for a thrifty option, your best bet is this Cap Hat. It's a popular product, while not very expensive. In this price range, you can also check out this Caribbean Joe Baseball Cap. It's also a popular item and won't break the bank. Or you can opt for this Pearl Izumi Baseball Cap. This item has all the potential to become a powerful player in your wardrobe.
If you're looking for something in between pricewise, consider buying this Cap Hat. While the price is very reasonable, this product is an easy wardrobe update.