If you didn't get round to finding a present for the political anorak in your life, and if times are a bit hard economically, may I suggest a copy of the accompanying documents for the Budget (Scotland) (No.2) Bill? Although a copy is online, this brief but fascinating work confirms that the Cabinet Secretary for Finance and Sustainable Growth and the Presiding Officer share the view that the SNP's second Budget is within the legislative competence of the Scottish Parliament.
A note at the end confirms the bargain price: just 30p. I will watch the Amazon bestsellers list keenly, although resale value may depend on how the Budget votes go.
I have a sneaky suspicion your tongue ISN'T in your cheek here...
Still, if they can sell 13billion copies then they've paid for the new bridge.