Cheap color ink cartridges?

Is there a place or website where I can get the CHEAPEST color ink cartridges? My dad always uses black instead of color ink. He says that color ink is expensive and drys out if it has not been used for a while. Please, I need to find the CHEAPEST color ink cartridges. Cheers. P.S. I'm a 14 year old boy... show more Is there a place or website where I can get the CHEAPEST color ink cartridges? My dad always uses black instead of color ink. He says that color ink is expensive and drys out if it has not been used for a while. Please, I need to find the CHEAPEST color ink cartridges. Cheers.

P.S.

I'm a 14 year old boy so yeah.
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