If you are on a limited budget, your best bet is this Rodd & Gunn Cap Hat. It's a terrific product, while not very costly. Another savvy option is this Patagonia Baseball Cap. While the price is not very high, be sure that this piece will become a wonderful addition to your wardrobe. You might also want to consider this Patagonia Cap Hat. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
For something in the middle of the price range, look no further than this Baseball Cap. This item doesn't cost too much, but definitely deserves a place in your wardrobe. Also look at this MCM Baseball Cap. It's an attractive option both price and quality-wise. Take a look at this DSQUARED2 Cap Hat too! Great value for your money.