I recommend two 5 CD sets of the complete Piano Sonatas, each costing around the price of one full price disc. The first, by Klára Würst on Brilliant Classics 94034, has had many favourable reviews and is very well recorded. Alicia de Larrocha on Sony 88883798592 has a slightly more romantic approach, and again, is well recorded.
John Lill has made a very fine recording on Signum Classics SIGCD 075 (full Price). The couplings are Brahms Intermezzi, Op.117 and Schumann’s Fantasy in C. A very cheap, but excellent, version has recently been reissued on Decca Virtuoso 4785404. The pianist is Stephen Kovacevich, and the filler is Brahms’s Piano Concerto No.1 with the London S.O. conducted by Sir Colin Davis.
Perhaps the best recording that Sviatoslav Richter made whilst visiting the UK was of a live concert, including this work, on 18th. June 1975. The performance is outstanding in every way, and the sound quality is very good, on ICA Classics ICAC 5084 (full price). The couplings are Beethoven’s Piano Sonata No.3 and some Bagatelles. Should you prefer a more modern recording, the young pianist Igor Levit has started, what I hope will be, a complete recording of the Beethoven Sonatas. Piano Sonatas Nos. 28-32 are included on a Sony 2 disc set (88883747352-budget price). The recording quality is excellent, and the performances are right up there with those of the great pianists of the past.
John Lill’s very fine recordings of Beethoven’s Piano Sonatas have been deleted, but individual discs are still available via internet retailers.