Can you explain what you mean by "civilian ribbon" please ? Are you referring to the little metal and enamel lapel badge that comes with the medal set for wear in civilian clothes ?
One of the key factors in the value will be the era of the medals and whether or not they were actually awarded. Hence are there are numbers impressed in the edge of them, are any of them named, and what type of broach they have (these can be used to date them) are all important. If you can get photos posted then we will be better able to help.
Cheers,
Paul