iBuy iRobot Blog Guide

I want to get a Roomba but it feels im going to drain a ton of electricity if it has the self-charge feature which i really like.
So I would like to know how much energy it needs to charge so I can get a Solar Panel or other eco-friendly energy source to charge it.

It was on woot.com yesterday, a two pack of the Roomba Vacuum cleaners. How much did they cost?