How much do it cost me to get a wide angle lens for my canon 400D.?

Question

How much do it cost me to get a wide angle lens for my canon 400D.?

Answer 1

I have the Sigma 10-20 lens it's a great wide angle lens, and about 20% less expensive than the Canon 10-22.

Answer 2

Sigma 10-20 EX DC lens around £300.  This is the cheapest way of getting something significantly wider than the supplied lens.