Yup alpine has discontinued their marine line. There has been no announcement of it being gone forever. My local retailer who is all JL and Alpine said they are pretty much redoing the entire marine line from scratch. He's not certain it "will" come back, bug was told they are very optimistic.
The huge downside is there were the only marine head unit with 4v pre amps which I absolutely loved.
CURRENT: 2008 SANTE 210
2000 Mastercraft Xstar
2004,2005 Ski Centurion Avalanche C4
2003, Ski Centurion Cyclone
99,2000,2001, 2002 Ski Centurion Elite V/Hurricane/lightning
88 2001 Nautique