All info about the lens here: http://www.sigma-imaging-uk.com/lenses/telezoom/70-300mmAPO.htm
It's basically brand new, never used outside. Comes boxed, with protective case and lens hood. It never came with a lens cap (which I thought was very strange) but the glass is unmarked and has been kept in it's protective case and box.
The cheapest I've seen this online is £129.99 without postage, my price is very fair and that's complete with postage.
Any questions, leave a post or a PM.
Payment via Paypal or preferably bank transfer (Barclays).