I have a cheap Casio DVD printer. The disk is loaded like a standard DVD drive. It can only really do text titling, in one of four colors depending on the thermal ribbon that is loaded. Black prints fastest for some reason.
I can print a hundred disks in a couple of hours, and it's never made a duff print. By choosing media with a suitable base color (I deliberately don't use white "printable" media), the final disks look pretty close to standard distribution media: not much shop-bought product has pretty pics on the disks themselves, that goes on the case inserts.