Each of the 10 sets of working drawings (plans) is available individually at $2.99 each
But if you buy the complete Volume you also get instructions of
how to build a basic box, supported by various photos of
the construction process. The other box designs follow similar
basic procedures but don't have separate instructions.
So you get a LOT MORE for your money

BUT you pay only $9.99 for the complete volume with 10 sets of working drawings.