So In my general cheapness I was looking for a substitute for colorfab LW PLA. In my travels I found this. It is polylite LW PLA. Apparently it is already "foamed" and you can print using standard
PolyLite™ LW-PLA
colorFabb LW-PLA Natural - 3DJake Polska
Polymaker PolyLite LW-PLA Black - 3DJake Polska
3D Print - New Light Weight Material??? - Polymaker Polylite PLA
Polymaker PolyLite LW-PLA Bright Yellow - 3DJake Polska
Polymaker LW PLA Filament 1.75mm Gray, Pre-Foamed PLA
Polymaker PolyLite LW-PLA Bright Yellow - 3DJake Polska
POLYLIGHT 1.0 – NAVY BLUE – LW PLA - WIND CATCHER RC
PolyLite Light Weight PLA (LW-PLA)
POLYLIGHT 1.0 – LW PLA Light Gray 1kg
Polymaker PolyLite LW-PLA Bright Yellow - 3DJake Polska
3D Print - New Light Weight Material??? - Polymaker Polylite PLA
PLA LW, wg rodzaju
Polymaker LW PLA Filament 1.75mm Bright Yellow