If you're budget-restricted, look at this Closed Jacket. It's a wonderful piece for a reasonable price. In this price range, you can also take a look at this Rag & Bone Jacket. It's also a popular item and won't break the bank. You might also want to consider this NYDJ Blazer. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're after a bargain, look no further than this Blazer. This item doesn't cost a fortune, but absolutely deserves a spot in your wardrobe. You might also be interested in this 3.1 Phillip Lim Jacket. It's an attractive option both price and quality-wise. Take a look at this Equipment Blazer Jacket too! Great value for your money.