I'm afraid I'm totally new to this and don't even know what I don't know yet, I'm coming into this from the taxation angle and illicit trade is a major concern across Africa but also very hard to identify given some of the issues I mentioned above (plus porous borders, corruption, etc.). I guess my general question is how much does one of these cost to build and maintain? If you could point me to any reading for a total beginner to get up to speed on the capabilities of the technology I'd really appreciate that too.