Now that we are talking of importing , I am interested in duties that one would pay for phones if imported via mail.

This device (http://www.expansys.co.za/acer-liquid-metal-205669/) costs Kshs 18,000 to purchase and ship, how much would I pay for duty?
The above device is available locally for upwards of Kshs 50,000 (what is with local shops and making profits in the hundreds and thousands of percentages?)