As an alternative, a firm favourite of mine for many years, Wilhelm Kempff performs Sonatas Nos. 8, 14, 21 & 23 on DGG 4474042 (medium price).
M. Guy’s interesting performances are available on a 3 CD set from Zig Zag Territoires ZZT 111101 (medium price).
Unfortunately, the superb recording by Clifford Curzon is only available as part of a large set, But some copies may be available via the internet. Stephen Hough provides a superbly performed modern recording, coupled with the Ballades Op.10, on Hyperion CDA67237 (full price). As a budget alternative, a favourite pianist of mine, Idil Biret performs the same programme on Naxos 8.550352.
M. Guy’s recordings of the three Brahms Piano Sonatas are on Evidence Classics EVCD 022 (two discs at medium price).