A few Mario games popped up today when Circuit City announced their $10 special for Memorial Day (USA):

Paper Mario: The Thousand-Year Door
Mario Kart: Super Circuit
Super Mario World: Super Mario Advance 2

I'm sure these games are gone by now (even in Pacific time zone, it's about 1:00 pm already), but good to know that if you happen to be at CC, you might come across a great deal.

Link: siliconera.com