Lexmark X7550 Ink (Black & Color)

[mrenticon]

so far, the best deal i could find has been best buy's buy one, get 2nd for 25% off, with in-store pickup. sometimes, it's not in stock and i'm stuck. and actually, right now, they don't have the color in stock.

so, any ideas on places to get black and/or color ink for my Lexmark x7550?

thanks.