How much is a copper coated wheat penny cost?

No such coin exists. All wheat pennies (with the exception of the 1943 steel cent) are 95% copper and are not copper plated (as the copper-plated zinc cents made from 1982-present). Wheat pennies can be found for as low as 3 cents in worn circulated condition (or found in pocket change!) and uncirculated specimens for common dates can be found for as low as $1.