Thanks for the info. That is what I was looking for, but all I could find was the stranded grounding wire bare, and I would really prefer solid.
I decided on the wire from Michaels. It is 16 guage dead soft copper and was very workable. 7 bucks for 15 feet isn't a bad price either.
I did have to look a bit though. They sell aluminum wire that is painted copper as well. The only way to tell the difference is to look at the cut end. Pretty sure this was 100% copper, so I feel comfortable with it.