The wait is over ... all major retailers should have some stock of Mario Kart Super Circuit for Game Boy Advance.
Why are you even reading this? Go get it!
Target stores have a great deal, selling the game for $25.88. All their shipments should be in, or coming today.
We'll have impressions up later today.
In the meantime, be sure to check out Nintendo's excellent (and newly opened) Mario Kart Super Circuit webpage for a sneak peek and all kinds of goodies!