Wouldn’t it be cheaper to just mail parents the report card?
Even cheaper would be to put the report cards online. Here, kids bring paper ones home and only bad grades have to be brought back signed. We also have them online so parents and kids can check individual homework grades and see if everything has been turned in. Easy peasy.
If parents can’t be bothered to ask their kids to show them their report cards, what makes anyone think those parents will make the effort to take time out of their day to drive to school.