You can't buy a Sigma SD1, but can win it in the US (speculation: will it ship in June/July???)
The mystery cloud remains around the availability of the Sigma SD1 DSLR, however, purchasing is not the only option! You could be the lucky winner that wins the Sigma SD1 in Sigma's 50th anniversary giveaway. This giveaway is for US residents. The entry period ends May 31st, 2011 and the winner be announced on June 1st, 2011 and the prize will be shipped to the winner within 30 days! The SD1 is the prize only for this time period, the remaining monthly giveaways for 2011 will feature lenses (read all the terms of the giveaway for all the details).
Speculation on Sigma SD1 arrival: will it ship in/by June/July?
As you can see from the terms and conditions above, the winner of the first giveaway will have her/his Sigma SD1 by July 1st, 2011. I am assuming they will ship the winner a production camera, not a mockup or a prototype or a rendering :-) So if they have a production camera to give the winner, does that mean that they will have the first batch of cameras ready by then or soon thereafter?
Assuming the planning of the giveaway was done in association with the manufacturing people, it wouldn't make sense to make the SD1 the May 2011 prize if they were not certain they would have a production unit to deliver by July 1st, 2011. They could have easily made it the December 2011 giveaway if they were not certain :)