Actually, the Wal-Mart ad showed it for $349, not $349.99, making it a shady ad. Plus, Speedy's thread made no mention of a price drop on August 8th at Target, CC, BB, so we'd assume they'd follow suit if there were a price drop.
My local Wal-Mart (Super) has the Premium for $380, and the Core for $280. So, this might be more widespread than people think.