The blazer is one of those wardrobe pieces that is bound to become your most worn thing. It will become your go-to coat for smart casual occasions.
If you're in a thrifty mode, your best bet is this Theory Blazer. It's a wonderful piece, while not very costly. In this price range, you can also check out this Calvin Klein Blazer. It's also a popular item and won't break the bank. You might also want to consider this Lucky Brand Blazer Jacket. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.