There are many facets to Online Marketing — many of which could be very valuable to your business’s marketing plan.
Consider SEO if there is a high enough (search volume) * (average gross profit per sale). The Google Keyword Tool will give a peek into search volume — it definitely does not automatically spill the search volume secrets.
If you think the value is good, it is a good idea to get an SEO Consultant that can provide high quality SEO Services — low quality yields basically no value to your business. I know of one guy that comes highly recommended: http://www.dallasseogeek.com/
He’ll probably take a look at your business’s online presence. <– not sure if he charges for it or not.
SEO can be a HUGE revenue source for your business — $1mil+/year no joke!