Where can I buy stainless steel or aluminum honeycomb/hexagonal mesh?

I'm looking for something to use as mesh for my pro-touring '76 Trans am and I would like to use something similar to the Obsidian Mustang however they used water-jetted aluminum and I would like to keep the cost reasonable. Do you know where I can buy something like this? I need about a 3/4 to 1 inch diameter and I would prefer the holes to be regular hexagons.