Check the transportation section of the site. You can compare rates of Mears vs cabs. Tiffany towncar is about $85 round trip. I don't think cabs are much different. You might consider a compact car. Hope you find a good price!
Mears is about the best bet price wise for a single person. You might be able to get two one-way car rentals on either end of your trip for somewhere in between the cost of Mears and a towncar.
One trip we took, we only needed transportation for getting to WDW, I found a National mid-size for $32.50 (fees included) for 24 hour. I picked it up at the airport and dropped it off at the Dolphin. You just need to check out the National/Alamo website to see what they have. There also is an Avis or Hertz office at one of the Downtown Disney hotels on Hotel Plaza Boulevard.
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