Walmart offers the Sun Joe Tiller Joe Max 9-amp Electric Tiller / Cultivator, model no. TJ601E, for $139 with free shipping. (Hayneedle has it for the same.) Excluding the below mention, that's the lowest total price we could find by $24, although we saw it for $3 less a year ago. It weighs less than 19 lbs. and features an 18" cultivating width, 7" cultivating depth, six angled steel tines, two wheels, and folding handle.
A close price: Target via eBay has it for $139.99 with free shipping.