If you're a frugal shopper, your best bet is this Mini Market Coat. It's a wonderful piece, while not very pricey. In this price range, you can also check out this Closed Coat. It's also a popular item and won't break the bank. You might also want to consider this Stella McCartney Coat. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're looking to purchase a designer item, then what you're looking for is this Agnona Coat. It's more expensive but worth your money. While you're at it, also have a look at this Herno Coat. Yes, this item is expensive, but it does not mean it's not worth it. You might also want to consider this Loro Piana Coat. You won't regret the money spent!