Buy.com offers the NES 8-Bit Handheld Portable System
(pictured), model no. RM-10325, for $34.99
. With free shipping
, it's the lowest total price we could find by $11. This gaming system requires 4 AA batteries (not included) and is compatible with original NES game cartridges.
Also at Buy.com (via GamezForLess) is the Retro Duo Twin NES and SNES Console, model no. RB-RD-1279, for $29.99 with free shipping, another price low.