Copper.org gave me 2 links to copper grid systems.
Erico (the Caddy Clip guys) makes a copper clad steel grid
http://www.erico.com/products/GroundGrids.asp Harger Lightning Protection makes a U/L listed #6cu grid
http://www.harger.com/catalog2004/1_4_8.pdf I don't know if either either of these is cheaper than a field built #8.
If the demand is there these would be the logical folks to cobble up #8 grids tho.
