Transit,
Here are approx values for graphite.
2012 Industrial Minerals Graphite Prices per Tonne
FCL CIF main European port
99% to 99.9% C, +50 mesh $4,500-$6,000
94% to 97% C, +80 mesh CIF $2,500- $3,000
90% C, +80 mesh $2,000-$2,500
94% to 97% C, +100-80 mesh $2,200-$2,500
90% C, +100-80 mesh $1,500-$2,000
85% to 87% C, +100-80 mesh $1,500 -$1,900
94% to 97% C, -100 mesh $2,000- $2,400
its all going to come down to flake size and carbon content.