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You can buy cartridges for Canon at a variety of places whether online or in a retail store. For the best price I would try either Amazon or Overstock. If you are willing to take a chance EBay.
The place to find the cheapest price on Canon ink cartridges will depend on the ink cartridge that you have. Many stores sell cartridges for around the same price, but Wal-Mart usually sells them for a little less.
For discounted canon inkjet cartridges try www.inkjetsuperstore.com or www.usa1inkjets. Replacement cartridges will generally meet the same standards as original cartridges but check the guarantee from the particular store you are buying from.
Amazon has some good deals on Canon ink cartridges. It's definitely cheaper than the store. You should check Atlantic Inkjet. They have good deals on all kinds of ink cartridges, so I'm sure they'll have your Canon ink cartridges.
There are two websites, 123inkjets.com and 4inkjets.com that sell cartridges online. If you are looking to go into a store for Canon cartridges, Staples would be a great option.
There is a store called Cartridge World that has locations all over New Zealand. Not only can you purchase new cartridges there, you can also get them refilled. The refill price is $9.90 for black and $10.90 for color.
Canon printers require Canon ink cartridges. However, if you have a refillable ink cartridge then you can go to a store like Best Buy or Wal-Mart and buy a generic all-in-one refillable ink.
Canon has a store locator that can help you find genuine Canon ink cartridges. You can also find there a list of reseller that are bound to give you the same cartridges. If you want to purchase more locally, you can search for canon and the name of your town as resellers often put in their front page the name of the brand they sell from.
Canon E20 Toner cartridges can vary in pricing from store to store. The average cost is anywhere from $10.00-$30.00 depending upon the store you go too.
Before throwing out ink cartridges, check online to see if the brand of cartridge can be recycled. If it cannot, like some Canon ink cartridges, simply take the cartridge to a store, like Office Depot or PetSmart, and they will dispose of the cartridge properly.
You can get a canon MP 980 cartridge just about anywhere. Online you could get it at amazon or at a store website. Amazon has really good prices.
One online store that will sell you refurbished ink cartridges is at the castle ink site. They have all the major brands for compatibility you expect like Canon, HP, or Lexmark.