I'd consider giving them WEB images, but I'd never give them a CD of all the images & I'd print on the CD a "NOT FOR PRINTING" notice.
If you sell a Cd of images to a non-pro who will make green, underexposed, crappy prints at the corner drugstore, not only will you lose the sales of those prints, but those will be your green crappy prints that will be shown to their friends & your potential future clients? 

