GameStop selling Wii 'rain check' certificates Dec. 20 & 21

According to comments made by Nintendo's Reggie Fils-Aime during a conference call with the press today (like, right now), GameStop will be offering Wii "rain check" certificates for purchase on December 20th and 21st ... while supplies last. (Yes, supplies of the paper slip). The certificate, which requires that a Wii be pre-purchased in full, guarantees a console in January, so long as it's picked up by Jan 29th. Geez, promises sure are expensive these days...