No where.
I thought I lost mine a ocuple weeks ago and couldn't find one anywhere- luckily I found the one I thought I'd lost.
I even put in a call to Aqualung and they have no more in stock at the factory- but we're willing to sell me a new D4.
Ted (unirdna) was looking to replace the one he lost last year. The closest replacement he's found so far is the Oceanic/Aeries Manta. There are fancier watches out there, but they all cost a lot more.
Jon
