Who buys copper pennies?

It really depends on what you have. The Lincoln wheat reverse minted from 1909-1958 are most desired by collectors. You can typically expect to pay around $5 per roll of circulated wheat backs. Lincoln memorial cents minted from 1959 to date are sought after in mint state condition. I myself buy rolls of Lincoln wheats, let me know if anyone has some to offer. I hope this helps out. Happy collecting!