I've been checking on fares too since we have an 8:30am horseback riding reservation in a few weeks and I really don't want to bus then boat then bus from BCV to FW that early in the morning. (I'd rather sleep in!

)
Mears has a taxi fare estimator on their site
http://www.mearstransportation.com/services/taxi-fare-estimator.asp
It was a little picky about the address format, but I got it to work by entering 1510 N COVE RD ORLANDO FL 32830 for OKW and 1600 7 SEAS DR ORLANDO FL 32830 for the Poly, and it came back with the following:
Estimated Fare*: $10.97
*Please note that the fare listed above is only an estimate and will vary depending on route taken, time of day and traffic conditions
But they also have a reservation form for hotel to hotel in a town car, and that one comes back $13 for one way! I talked about it with DH, and he thinks the convenience of the town car is worth the extra money (his exact words were, "we're on vacation let's splurge"). Even adding in an extra $5 tip it's still less than 20 bucks.