Update [12/8]: Out of stock at Walmart, but Amazon matched the sale. 

Walmart has the Jetson J5 Folding Electric Bike on sale for $298 with free shipping. 

• 350-watt motor, Top Speed: 15mph, Max Range: 15 miles (30 miles with Pedal Assist)
• Weight limit: 265 lb, 14" Tires, 5 hour charge time