Ars Technica has an extensive review of the Nintendo Wii. According to Wiiseeker, various Wal-Mart and Target stores get a new shipment on Sunday (I am sure Toys R Us is getting shipments too, but buyer beware).
For that matter, player beware. Notice to couch potato gamers: the Nintendo Wii involves using muscles in your body other than your thumbs. This may result in unfamiliar strain. Fear not – there are safety instructions.