Purchasing a car in Cape Verde can be very expensive because of import duties and other taxes. Expect to pay double the price you would pay in Europe or America. In addition, they do not take into account the age of vehicles here in setting the price, only the make and model. So a car that is 5 years old will have the same price as the same car 5 years later.
One option used by many is to import their own vehicles. Returning immigrants can import one car duty free. However, if you are not a returning immigrant, you will pay a 100% import duty if the car is 5 years old or more; newer vehicles have lower duties but the duty is still very high.
Foreigners relocating to Cape Verde can avoid the import duties by starting a business and importing the car in the name of the business. You will owe nothing for 5 years (and you cannot sell the car for 5 years). After 5 years you must then pay the import duty. But you can simply sell the car for double your purchase price and then payoff the duty, or you can leave Cape Verde with your car and owe nothing.
Keep in mind the cost of shipping into or out of Cape Verde. This cost can reach a few thousand dollars. The cost of maintenance can be very high if you take your car to a local dealership or a local mechanic who has been professionally trained abroad.
The best deal is to import a USED car (in the name of a business you created), rather than a new car. Service the car at a local mechanic rather than a dealership. Then sell the car after 5 years and repeat the process. You should have enough money on the sale to pay any duties and to import another for your business.