inexpensive dell printer cartridges-black and color

Hi! I bought Dell Photo AIO Printer 926 without realizing that the cartridges have to be purchased from dell and they are costly- any suggestions for alternate sources (cheap) that may work on this machine?
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I have the same printer and I don't know of any other cartridges that fit in them. Are the Dell cartridges that much more money than any other name brand? or, is it just that you can get generic brands for other name brand printers but not for Dell?

Anyway-I know Staples is selling Dell stuff now, i wonder if they have the cartridges for a better price?