If you'd rather not spend much, your best bet is this Asos Blazer. It's a popular piece, while not very costly. Another strong contender for your wardrobe is this Religion Sport Coat. While the price of this piece is rather reasonable, it will surely attract a lot of attention. Or you can choose this Asos Suit Jacket - be sure you'll be making a stylish addition to your wardrobe.
If you're looking for a happy medium, look no further than this Paul Smith Suit Jacket. This item doesn't cost too much, but absolutely deserves a spot in your wardrobe.