Q about the Sigma 12-24mm price.

Hi,
I have a little spare $ and would like to treat myself with UWA lens.
From all my options I think I choose Sigma 12-24mm the 1st version.

I will mostly use for fun and abstract photography, that is why 12mm is appealing to me.
Anyway, How much used Sigma 12-24mm 1st versin for Canon might cost?

I checked few places on the internet, but it seems like this lens is not so popular and does not sell too much and I just can't find my answer on google. Thank you.
JAcek
--
"I walk, I look, I see, I stop, I photograph"-Leon Levinstein 1955
http://www.JacekDolata.com