Canon PIXMA All-in-One Printer & Software Bundle

Not sure what the difference is, but I just bought a NIB MG3520 for $39.99 and free shipping:

So far it’s working great!

After checking out I would say the difference is in whether you have faith/trust in the seller:

There is a class action lawsuit pending against Canon for their MG series printers print-heads becoming faulty for no reason.

Happened to me after ~ 6 months.

This one isn’t on the list of affected printers.