that's $100 off the retail price. enough off to have me consider buying one and either using my AC66 as a media bridge or wifi extension or selling it on eBay.
http://reviews.cnet.com/routers/asus-rt-ac68u-dual/4505-3319_7-35828165-2.html this one is way faster than my AC66
http://reviews.cnet.com/routers/asus-rt-ac68u-dual/4505-3319_7-35828165-2.html this one is way faster than my AC66
This looks good but

