If you're a frugal shopper, this Reiss Pea Coat will fit the bill. It's a popular choice, while not very expensive. In this price range, you can also take a look at this Sunnei Pea Coat. It's also a popular item and won't break the bank. You might also want to consider this Woolrich Pea Coat. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're looking for a bargain, why not consider this Hardy Amies Pea Coat. While the price is very reasonable, this piece is an easy wardrobe update.