I currently already have a bike that I bought from LBS, manufacturer outlet actually, but mixtes aren't exactly common which is why I am excited about this bike on BD. I can't walk into any LBS and expect to find a mixte which is what makes this BD bike attractive. I would not even consider BD if that were the case; I just happened to be browsing their website when I found it.
I do see a bunch of mixtes on Craigslist, but they seem mostly to be road bikes. They look like they have steep angles, drop bars, etc.