we use 3 grades for our heatsinks
1) old aluminum - aluminum heatsinks other than extruded and extruded heatsinks with fans or screws (.50ish per pound)
2) extruded heatsinks cleaned (.70ish per pound)
3) copper aluminum heat sinks (1.40ish per pound)
http://s1183.photobucket.com/albums/.../heat%20sinks/
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