Nintendo's Wii has been a hot item ever since it launched last year, and with Super Mario Galaxy now on store shelves Nintendo's not expecting demand to cool down one bit. According to the BBC, "high street retailers are struggling to keep up with demand for the console, which has been in short supply for months."

Nintendo has warned consumers once again that Wiis could be quite difficult to find this holiday season. The company said it's doing "everything possible" and it's shipping an additional 3.5 million consoles globally to attempt to satiate demand.

"The demand for Wii hardware globally has been unprecedented and higher than Nintendo could ever have anticipated," a Nintendo spokeswoman told the BBC. "Nintendo is now in a position in which seasonality demand trends are being broken, therefore the demand for Wii hardware is constant throughout the whole year globally. Due to this phenomenon it is possible that the demand for Wii hardware may outstrip supply."

Nintendo of America President Reggie Fils-Aime previously said that Nintendo would provide "unprecedented" Wii supply for the holiday season. However, he later said that Wii inventory typically only lasts one day and that it's likely demand would not be met.

"The issue is not a lack of production. The issue is we went in with a curve that was aggressive, but the demand has been substantially more than that. And the ability to ramp up production and to sustain it is not a switch that you flick on," he commented last month to the Mercury News. "We're working very hard to make sure that consumers are satisfied this holiday, but I can't guarantee that we're going to meet demand. As a matter of fact, I can tell you on the record we won't."

Nintendo is expecting to ship a total of 17.5 million Wiis this year.