I think that $144 is for MCO, not Sanford! I didn't think that
FL Tours went to Sanford. I have used a car service there and back..runs about $200, plus tip. With the time of year that you're going, you may find this to be cheaper than a rental car. They will also do a 30 min grocery stop for you, so you can get food and such..especially nice when you're staying DVC!
The drive is an easy one...takes about an hour. But, it may just be easier to get a towncar service! Then, sit back and let them take care of the driving! I used Tiffany Towncar with good results. But that was awhile ago.