Is there a small portable (USB/firewire) device currently available dedicated solely for printing directly to CD/DVDs, or must I invest in a full fledged printer like the Epson R200/R300/320/500/800 ?

I would expect with printing directly to CD/DVD discs becoming increasingly popular now, that a lot more 'print to CD/DVD' devices (included one's solely dedicated to printing to CD/DVDs) to become availble for sale as well. Curious what 'Print to CD/DVD' Media Printer (brands/models) are currently available (or scheduled to be released soon). Thanks. - Scott