This poses a cataloger's dilemma!
The newest "Akitada" mystery, The Crane Pavilion, is out -- it was apparently self-published by I.J. Parker earlier this month (most of the previous Akitada novels were initially published by regular, commercial publishers). As an ebook it seems to be available only as a Kindle edition from
Amazon.
I put this here, rather than in "Reading Recommendations" since it is currently selling for $3.99 -- half (or more) off the price of the other Akitada novels. I don't know if this will be the regular price, but since it only just came out a few weeks ago it could be a temporary introductory price.
At any rate, this is a good deal.
Description of the Sugawara Akitada series at Wikipedia:
http://en.wikipedia.org/wiki/Sugawara_Akitada