Worx GT via eBay offers the Worx 48-volt Max Lithium Cordless Grass Trimmer and Edger, model no. WG190, for $99.99 with free shipping. That's tied with last month's mention as the lowest total price we've seen. (It's a current low by $56.) It features a 13" cutting diameter, adjustable handle, and weighs less than 8 pounds.
There's a less expensive way, and then there's the way that works for you. The two may not be the same.