Scott
My memory says cost was in the $35/sq ft range - that was completely assembled w/ border in most areas and the adhesive to apply.
The PlasDeck FAQ's indicate material alone runs around $20/sq ft if you make your own panels. I considered that but not for long... they did a nice job and all the pieces are glued and plastic welded which you can't do if DIY -
It does get warm on bare feet when in the direct sun - we just spray some water on it if we find it warm under foot.
Edit: PlasDeck was very good at providing an estimate from a dimensioned sketch I sent them. Early est was very close to final price based on full size template. They provide a pdf of the template w/ plank & border layout for your approval - we went back & forth a few times until layout was approved and they went to work.