If you can’t spend much, your best bet is this L'Agence Jacket. It's a fantastic item, while not very expensive. Another strong contender for your wardrobe is this Blazer. While the price of this product is not very high, it will definitely attract a lot of attention. Or you can choose this MinkPink Blazer - be sure you'll be making a stylish addition to your wardrobe.
If you're looking for a happy medium, take a look at this DVF Blazer. While the price is very reasonable, this item is an easy wardrobe update.