The cheapest for two is most likely the transfers DCL offers. But they may not be the most convenient. For a few $$ more (and truly not more than that) you will may more flexibility and convenience by doing two 1 day car rentals. Most of the rentals have offices at both MCO and Cape Canaveral and offer shuttle service to the port (and back).
Check out dcltribute.com for more discussion on rental agencies that service DCL.
Yea, but after they add: taxes, fees, service charge, sales tax, recoupment, the governments cut, the airports take, you'll be up over $50 each way easily.
They could give you the car for free and it would still cost you an arm and a leg... but it's the way we go.
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