The lack of trays for Canon printers has been a big problem. Take a look at
www.cd-trays.com

nosuchaddress@email.com wrote:
I just did a search of e-bay and there seems to be no shortage of tray
type B, C, and D, the offical canon one with the handy dandy center
hub. Between $20 and $30 shipped in most cases.

http://pixma.allhyper.com/ contains all the info one needs for all
models except the new ip4300 which has yet to hit stores.

Don't get me wrong, i'm all for a commercial venture making these
puppies, just presently there does not seem to be a shortage of the
real McCoy.