That sounds smart, though I can't imagine a huge copper bar came cheap. You can get something for as little as $17 off Amazon, and maybe cheaper if you look harder: https://www.amazon.com/Skywalker-Signature-Ground-Rod-4ft/dp...
Back when Radio Shack was closing I put the damper on some guy who was going to buy all the grounding rods thinking he'd scrap the copper. I did him the favor of disappointing him before he spent his money.