stonerosedesigndotcom asked:
The example I have is “Search engine marketing offers unmatched power and flexibility. We do it affordably and effectively.”
The example I have is “Search engine marketing offers unmatched power and flexibility. We do it affordably and effectively.”

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Yes it is a legitimate word. It is the adverb form of the adjective afordable. One might say a house for sale is affordably priced.
af·forda·bili·ty n.
af·forda·bly adv.
affordable – that you have the financial means