I looked at the battery holder tabs... My concern with them is availability, cost, and the simple fact that they are not flat. I could see going with this solution as a worst case scenario.
On the topic of making my own....
I found these copper sheets which come in 12"x12" sheets:
https://www.onlinemetals.com/merchant.cfm?step=2&id=93
Now my question is how would I cut a the sheet consistently and/or cleanly?
From my calculations, i should be able to get 4000+ pieces(.1875" square) per sheet!
12" / 0.1875" square pieces = 64
64 * 64 = 4096
Ideally I'd like something premade... I'm just preparing for a worst case scenario.
Thanks for the suggestions