CDs - Good trick to reduce a project's CDR usage

I bought a bunch of 1gb flash drives with my logo on them. I sell one to every client at my cost and dump all the rough mixes they ask for onto their drives. They bring them in to every session. I bounce tracks right to the drives. Saves CDs/HD space and is generally more organized. It's worked out well so far. Some clients are totally computer illiterate and require audio CDs, but I've cut down on using discs by about 75%.