Blazers from Gilt
If you are on a budget, this 3.1 Phillip Lim Double Breasted Blazer will fit the bill. It's a foolproof choice, while not very expensive. Another strong contender for your wardrobe is this Façonnable Double Breasted Blazer. While the price of this item is not too high, it will surely attract a lot of attention.
If you're a bargain shopper, why not take a look at this Dolce & Gabbana Blazer Jacket. While the price is very reasonable, this piece is an easy wardrobe update. It's also worth taking a look at this Elizabeth and James Blazer Jacket. This piece is extremely popular and, just as importantly, not too pricey. Alternatively, opting for this Helmut Lang Jacket is a nice choice as well!
If you're looking at it like an investment piece, look at this Balenciaga Blazer - a great luxury choice. Why not take a look at this Paul Smith Blazer too? Expensive, but worth every penny.