I just bought the Apollo Twin, so I no longer need my Duet 2. It's the newer version that includes the lightning cable (as well as the standard dock connector cable) for use with newer iPhones and iPads. I bought it in September, but just opened it up and began using it this month when I got my monitors. It's a shame I even have to get rid of it, but I need the DSP in the Apollo.
$400 + shipping. That's $200 off regular price, and it's only been lightly used for a few weeks. Box, manuals, etc included.