Bike tutorial shipped on DVDr and downloadable 10 hours total £42 quid.
P and P for DVDr is at most 3 points £3 GBP that includes the cost of postage anywhere in the world and the cost of the disk not to mention someone's time to burn the disk.
If you buy more points the price goes as low as 0.62p per point, do the math.
David. 
From a readers' Q and A column in TV GUIDE: "If we get involved in a nuclear war, would the electromagnetic pulses from exploding bombs damage my videotapes?"