If you're a budget-conscious shopper, your best bet is this Topshop Blazer Jacket. It's a great piece, while not very pricey. You might also be interested in this J.Crew Blazer. It's a product you'll love which also doesn't cost the earth. You might also want to consider this Joan Vass Blazer. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're a bargain shopper, look no further than this Smythe Blazer. This item doesn't cost too much, but absolutely deserves a spot in your wardrobe. Why not also look at this Jacket. It's an attractive option both price and quality-wise. And do check out this Rag & Bone Blazer Jacket! It's a very popular item and good value for money.