As I remember, this was discussed sometime ago on HN. I dont remember exact link posted on HN but here is techcruch article of a start-up that was discussed on

As I remember, this was discussed sometime ago on HN. I dont remember exact link posted on HN but here is techcruch article of a start-up that was discussed on HN http://techcrunch.com/2013/10/14/australian-startups-zookal-and-flirtey-to-begin-delivering-textbook-orders-by-drone/ http://techcrunch.com/2013/10/14/australian-startups-zookal-...