This offer includes the following three books for a total price of £12 + postage and packing.

Moving On

Currency in an Independent Scotland

A Clean Currency for a Prosperous Scotland

The normal price for these books would be £18 + postage and packing (a saving of £6 with only one postage and packing charge).
This offer gives you the original book by Anderson and Morrison plus the book by Andy Anderson written after the Independence referendum, but before the Brexit process, and finally the most recent book by Andy Anderson which was published in February 2019.