Warren Mosler's Soft Currency Economics II is now available for purchase as a Kindle ebook for $2.99. It is free to Amazon Prime members.
While you are there, pick up a copy of The Seven Deadly Innocent Frauds of Economic Policy. It's only a buck in the Kindle edition.
And if you haven't already ordered it, get a copy of Randy Wray's just published Modern Money Theory: A Primer on Macroeconomics for Sovereign Monetary Systems while you are at Amazon. This is a reworking of the MMT primer series Randy put up incrementally at New Economic Perspectives over the last year. The paperback is only $28.85 with free shipping in the US.
That's quite a deal for under $35.00.