Replacement Ink Cartridges?

Cannon MP600 Printer (just purchased) Makes beautiful copies but where do I find less expensive cartridges? At Staples where I purchased this printer a complete sex of six which includes 2 blk,lylo,lrd,lbl, costs $50.00 I tried refilling them but to no success. If one color is low, the printer will not print... show more Cannon MP600 Printer (just purchased) Makes beautiful copies but where do I find less expensive cartridges? At Staples where I purchased this printer a complete sex of six which includes 2 blk,lylo,lrd,lbl, costs $50.00 I tried refilling them but to no success. If one color is low, the printer will not print even with the filled black cartridges. I tried printing one picture & it sucked the brains out of the color cartridges. Where to buy refills, please advise. Thanks
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