It is possible to refill your own cartridges, however it does require a special kit and supplies to do so. It is easier to send in the cartridges to be recycled and get a small amount of money for it.
The price of a Canon PIXMA MP460 All-in-One printer will vary from seller to seller. Amazon has one for about $300 and a used on for about $80. Cheaper options are available on eBay.
Office Depot has every cartridge type available so you should have no problem finding a replacement. The best way to go however, is to get a refill kit and fill it up yourself using a provided syringe type tool and your old cartridge as the refilled unit and then back into the printer.
The Canon Pixma MP460 bubble jet printer with built in scanner specifications are up to 22cpm printing black and up to 17cpm printing color. Scanner resolution of 1200 x 2400 dpi optical and 19200 x 19200 dpi interpolated.
There is a myth that printing text with a Canon MP460 ink cartridge will take up more ink than printing a picture. This is not the case. A picture will always take up more ink because there will not be nearly as much white space. The myth probably started because a color ink cartridge has to mix all of the color to make the black for the text, so people assume that it uses more.