I'd be skeptical. I have "purchased" this lens from two different internet camera stores - one a very big name seller. Both listed it as "in stock". Both purchases were using PayPal and ended up as refunds, eventually. The first seller contacted me saying that "the packaging of the lens we had in stock appeared damaged and so we have sent the lens back to Sigma for further inspection. Unfortunately that was the only one we had in stock." They promised that they would be receiving a shipment in a couple weeks. I waited and waited, no luck.
The second seller never sent me an order confirmation, so a few days later when I called, they said, "Oh yeah, it should ship out tomorrow." Then a few days later came the news that it was not in stock and they were waiting on Sigma to ship more. They were pretty sure it would only be a few weeks. I said the hell with it and got a refund.
So be prepared to wait! I figure, if I've got to wait for whatever, might as well hold out for the Pentax DA 60-250.
"A lens in the hand is worth two on the Internet."