Depends on where in the world you live.
In the U.S. my understanding is that Epson is the only brand available to use because of copywrite.
Internationally you can get an Epson or a Canon.
I've heard that HP is also being added to the mix, but whether this is US or world I do not know. I've read that in the US you can by the Canon printers, and then on Ebay buy the trays and software to print CD / DVD labels.
Check out this link http://club.cdfreaks.com/showthread.php?t=197508
When all is said and done, I have an Epson R300 printer, and it is unbeatable in it's ability to print on printable disks. This system is much better than the lightscribe alternative.