The first One Piece DVD has been scheduled for release on September 27th, according to listing info on the AAA Anime Website (via Anime News Network, via AnimeonDVD).  The second volume will appear on November 8th. 

 

One Piece has been shown on Cartoon Network (see 'One Piece on Toonami in April') and on 4Kids TV, but the property has yet to achieve the success it had in Japan, where it is one of the most popular anime series.