If you're a thrifty spender, your best bet is this Trenchcoat. It's a terrific piece, while not very expensive. Also check out this Barena Trenchcoat. It's an item you'll love which also doesn't cost the earth. You might also want to consider this Woolrich Trenchcoat. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
For something in the middle of the price range, why not opt for this E. Tautz Trenchcoat. While the price is very reasonable, this product is an easy wardrobe update. In this price range, you can also check out this Herno Trench. It's an attractive option both price and quality-wise. Check out this Stone Island Trench too! Great value for your money.