It seems that now would be a very good time to pick up a Wii if you still haven't picked one up yet. Online retailers such as GameStop no longer have the system in stock.
On certain websites you can find that the system is on backorder. New Wii systems can still be bought at Amazon but are not being fufilled by the company itself, but rather other retailers are fufilling these orders for them.
Since last October, Nintendo has bundled the Wii console with New Super Mario Bros. Wii and a Super Mario Galaxy music CD for a retail price of $149.99. The Wii's recent lack of stock could be sign that this holiday bundle as Nintendo described it upon release may be in it's final days. The Wii sold nearly 95,000 systems last month. In June 2011, the Wii sold 273,000 units after a May price drop.