Ebay offers Sharper Image R/C Gravity Rover for $10.99 (reg $39.99) with free shipping.

Product Description:
Gravity Rover climbs from floor to walls and even onto the ceiling! Downforce propellers and oversized wheels help the rover drive up any surface and cling to the ceiling. 2.4 GHz remote control allows for long-range control. Gravity Rover can move in multiple directions, so you get to decide where it goes! You’ll never lose sight of the Gravity Rover with under-glow LED lights to help you see where it’s going. Great for play at any time of day! Kids will love driving the remote-controlled car on floors, walls, and the ceiling! Perfect for winter play, rainy days, or anytime kids are inside! Gravity Rover even contains a rechargeable lithium battery so that you never have to stop playing!

• Number of Pieces: 2
• Dimensions (Overall): 2.08 Inches (H) x 4.92 Inches (W) x 4.09 Inches (D)
• Weight: .12 Pounds
• Suggested Age: 6 Years and Up
• CPSC Choking Hazard Warnings: Choking_hazard_small_parts
• Educational Focus: Technology
• Vehicle type: Car
• Material: Plastic
• Power Source: Battery
• Battery: 4 AA Alkaline, Required, Not Included