Interesting. According to this site, Workbench 3.0 on CD-ROM doesn't exist:
http://www.gregdonner.org/workbench/
What's interesting is that there's a scan of the disc while the ad says the jewel case is still wrapped in plastic. Also, the CD looks like one of those you can print on with an Inkjet printer.
I also recall WB being sold on CD in some old magazine, but I somehow doubt they'd sell it on CD's made to be printed on by inkjet printers - those weren't available back in the days.
