Ftry googling there are plenty of courier booking companies that offers good rates that joe public will never get direct from the actual courier. They use all the big companies and tell you who they use often giving a choice. You can then select a courier you trust at a price which is not too steep. Prices vary a lot, I used to send parcels to the Algarve and 25-30 kgs would be quoted between £30 and £100.