If you're in a thrifty mode, your best bet is this Nonoo Double Breasted Blazer. It's a fantastic item, while not very expensive. Another nice option is this J Brand Vest. While the price is not too high, be sure that this product will become an excellent addition to your wardrobe. You might also want to consider this Helmut Lang Vest. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
For something in the middle of the price range, look no further than this Vince Blazer. This item doesn't cost too much, but absolutely indispensable in your wardrobe. It's also worth considering this Theory Blazer Jacket. This product is ultra popular and, just as importantly, not very expensive. Alternatively, opting for this Isabel Marant Blazer is a nice choice as well!