Tangentially related, but I was at my local Home Depot, buying a grounding rod. It seemed like an amazing deal -- 5/8", 8 ft for $19.60. Weighing it, it's 6.6 lbs.
Scrap prices according to the web are $3 to $3.30 for that quality of copper. Which means I could potentially be making $2 / rod buying them and selling them to the scrap yard...
It makes me wonder if the Home Depot prices are just lagging the market. Maybe I should stock up.