Need a power cable for iMac

For what country?

U.S.? Amazon has them in white. Just type in power cord for Apple iMac in the search box. About $15 or so.

it's a industrial std ac power called named CEE7/7 C13 CEE7/7 C13 - Google-søgning

if you wish it to be white and more apple plug looking then apple imac CEE7/7 C13 - Google-søgning