Joystiq is reporting that some Toys 'R' Us's have broken the street date for BioShock and have begun selling it.
Our local Toys 'R' Us opens at 10am, so I'll call then to find out if they have it. I'll update this post to let you know.
UPDATE: One store said, "I haven't gotten it yet. Call back at 12 or 1." The other said, "The street date is 8/21." It seems that perhaps, that second store had been tipped off because his response was so quick and automatic. That's all he said to me.
I'll follow up at noon to see if the first store hasn't caught on yet.
UPDATE 2: The cat is out of the bag. Toys 'R' Us stores have received a fax telling them not to break the street date. At my local GameCrazy, the employee said that they had received a call from corporate telling them the same.