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 Super Air 210TE
Previous : 2000 X-Star, 3000lbs ballast, LTR 330, Acme 1235 14.5X14.25prop. 1200 hrs of flawless fun