In Europe are available at the moment:

(1)
Paderewski on Welte-Mignon rolls :
recordings on Welte-Mignon rolls from the collections of the National
Library in Warsaw and Museum fuer Musikautomaten, Seewen, Switzerland ;
Liszt, Schubert/Liszt, Paderewski, Beethoven, Chopin = Ignacy Jan
Paderewski
 - Nagrania na rolkach Welte-Mignon. - Warsaw : DUX Recording
Producers, 2001. - 2 CD : DDD ; 12 cm + Begleith.

(2)
Welte-Mignon Piano : Hotel Waldhaus Sils Maria. - Zurich
 : Tudor Recording, P 2001.
 - 1 CD : DDD, stereo ; 12 cm + Beih. (Musique oblige)
Enth.:
 - Aufforderung zum Tanz : op. 65 [EST: Aufforderung zum Tanze]
 / C. M. von Weber. Artur Schnabel [Kl].
- Valse lente aus "Coppelia" [EST: Coppelia <Valse lente> / Arr.]
 / L. Delibes. Arthur Nikisch [Kl].
 - Intermezzo aus "Cavalleria rusticana*
Remark: These recordings are not representative for Welte because of the
poor performance of the piano; the reproducing mechanism worked only
partially...

(3)
Rudolf Serkin - his earliest recordings : approx. 1928 ;
Welte-Mignon piano rolls / J. S. Bach ; Fr. Schubert ; Fr. Chopin. -
Kehl : Verein fuer musikalische Archiv-Forschung; Heidelberg :
MusiContact [Vertrieb], 1992. - 1 Compact-Disc + Beih. (Archiphon)

(4)
19th century pianists :
[on Welte-Mignon ; the closest approach to 19th century piano
interpretation ; Camille Saint-Saens plays Beethoven, Chopin and
Saint-Saens, Carl Reinecke plays Mozart and Schumann, Theodor
Leschetizky plays Mozart, Chopin and Leschetizky].
- Kehl : Verein fuer Musikalische Archiv-Forschung; Heidelberg :
MusiContact [Vertrieb], 1992. - 1 Compact-Disc + Beih. (Archiphon)

(5)
Vladimir Horowitz 1926. - [S.l.] : Intercord, 1988.
 - 1 Compact-Disc + Textbeil.(Welte-Mignon)
Remark: Now by EMI; Intercord was sold to them.
All other Welte recordings produced by Intercord are not longer available.

This list is most probably not complete, there may be a few other
Welte-recordings still be available at Opal/Pearl in England.

Kind regards

Gerhard Dangel
Augustinermuseum
D-79098 Freiburg