No taxes are included in those prices....
I did a search, as well as one on Taca's web site (Gold Status) No mention of this $199 special from Chicago. I did find a few in the $350 range if you are diligent and search a lot of dates, as their web site is NOT the most user friendly...
Check weekday to weekdays, and sometimes on weekends on either AA or Continental, always seeing flights from $284 to $293 Al In (taxes included) out of ORD
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I normally start with kayak, do a 3 day flexible search on both sides, find the best price and go to that individual airlines website...