Try the Original Copper Heeler Insoles: As Seen In The Press - YouTube
Copper Fit Copper Infused Dual Layer Foam Shoe Insoles, Black, 2-Pack - Maximum Cushion for Work Boots and Shoes, Cooling Vents in the Safety Accessories department at Lowes.com
Copper Fit Work Gear Arch Relief Orthotic Insoles, One Size Fits Most - Walmart.com