From (where else), DigiTimes:
One supply chain source says it'll be released later in the fourth quarter (which we're now in, by the way). Meanwhile, ASUS, DT reports, says it "has no plans to launch a $99 Nexus." Which is nice, but it's Google that sells this thing, not ASUS.
Chances are if we do see a $99 Nexus 7, it'll be carrier subsidized. Which would be ridiculous given the outright price is only twice that.