The official website for VLC airport has a taxi information section that says the fixed price for taxis from the airport to the city center is 20 euros plus an airport tax of 5.40
The best pre-arranged taxi service I have found so far is KiwiTaxi, which claims 30 euros total for an economy-size taxi that will include a person standing at the arrivals/baggage claim area with a sign that has your name on it. This might or might not be worth the 4.60 difference, depending.
Does anyone here at RS forum know of a better deal or arrangement?