I have found the TPA rates MUCH higher then the MCO rates.
The least expensive I have found so far is through Thrifty using the Walmart code , found on mousesavers WMRT. For two weeks (Dec 17-Dec 31) intermediate car the rate was $356 US inc. taxes and fees. I made this ressie at least one month ago and haven't checked rates then so it might be higher or lower now.
Can you please do me a favor and let me know the best rate you found. I am seriously considering flying in/out of MCO vs. TPA (we are also skipping WDW and doing a beach holiday this year) since in MCO I can get a rate of $211 two weeks all inclusive intermediate.