Not exactly free, but it's the best price yer gonna get on a no contract Android phone.
Optimus Slider - $40
http://www.virginmobileusa.com/shop/cell-phones/lg-optimus-slider-phone/features/
Venture - $50
http://www.virginmobileusa.com/shop/cell-phones/venture-phone/features/
PCD Chase - $50
http://www.virginmobileusa.com/shop/cell-phones/chaser-phone/features/
Beggers can't be choosers.