Walmart offers the Nintendo 2DS Portable Gaming System
in Crimson Red, model no. FTRSKAAA, for $79
with free shipping
. That's the lowest total price we could find by $21, and within a buck of the lowest total price we've seen. It's fully compatible with 3DS and DS games, but doesn't play games in 3D. Other than that, it features the same functionality as the 3DS (WiFi, local multiplayer), plus a sleep function.