Carol is 100% correct in saying to ask for the TOTAL (bottom-line) rental price. We were shocked recently when renting from our long-time person on here that his rates had risen substantially because the initial quote was WAY lower than the total price with 'taxes & fees' -- which he didn't give us until we asked. It would appear that 'surcharge' is becoming mighty popular -- and while it doesn't surprise me to see those things here in the US, we had never encountered them before in SXM. (Airport recovery fees are common everywhere, whether you get your car directly at the airport or are shuttled off airport grounds).
Ask for the total rental price and if you don't like it, try somewhere else. We ended up getting a quote of $116 less than our original quote for the same time period, same car. Both of these quotes were from respected car rental places on SXM. That's nothing to sneeze at, even if one has to take a 5-minute shuttle ride.