Suppressing Invoice pdf prints

I am wondering how other users handle a request for when a customer wishes not to receive an invoice printout.  We run our invoice job R42565 nightly and we generate hundreds of invoices.  Of those hundreds of invoices, certain customers would rather not receive an invoice.  It is not feasible to sort through the entire pdf and skip specific invoices.  Does anyone else have this issue?  How do you handle it?

Thanks,

Jason