If you are on a limited budget, your best bet is this Theory Blazer. It's a popular item, while not very costly. In this price range, you can also take a look at this Kensie Blazer. It's also a popular item and won't break the bank. You might also want to consider this BCBGeneration Blazer Jacket. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you can afford to splurge, then you absolutely must check out this Jacket. This product seems costly, but it's worth it.