I got this tray. When I got it is was $13.99 plus $4.50 or so shipping. I noticed now they are 18.99. But they do work great. I don't know if it is true, but the site claims that the oem canon trays are glossy and they don't work that well without the rollers(unless you bought your canon outside US then they don't have rollers, if they came with rollers they would probably come with the cd tray too). My tray feeds and I don't have to even push it to get it started. Just put it in the tray, put the tray in the printer and push it in. Hit print and let it go to work for 45 seconds and voila, I have a printed cd. Then I spray it with the acrylic. Like mentioned earlier this does take some practice to get an even coat that doesn't look globby.
ps. Dan, the guy I dealt with at PE Labs was a joy to work with. I think PE Labs is fairly new at selling these trays and I couldn't find much reference about them so I just took a chance and he shipped my stuff out immediately and was very prompt answering any of my questions. So do not be afraid to order from PE Labs.