Have a look at Mears Taxi web site, they have a fare estimator but its not working at them moment. Depending on how many of you there are you may be better off getting the Mears shuttle pick up to Universal/IOA which is about $15 return each.
In June we took a cab from POFQ to UO. It was $38 one way (plus tip)
We prefered the extra cost for a cab and have the flexibility to leave/go as we pleased. Bell services at your resort will hail the cab for you, they are usually waiting in the parking lot. We were on our way within 3 minutes. Perfect!!