For something in the middle of the price range, consider buying this St. John Double Breasted Blazer. While the price is very reasonable, this item is an easy wardrobe update. It is also worth considering this St. John Blazer. It's an attractive option both price and quality-wise.
If you can afford to splurge, then you absolutely must check out this St. John Jacket. This item seems pricey, but it's worth it. Why not take a look at this St. John Blazer too? Expensive, but worth every penny.