There is a great Mosaic Records box set of the complete Swing/HMV recordings of the Quintet of the Hot Club of France. Django Reinhardt appears on all the recordings, and Stephane Grappelli appears on most of them. The recordings are low-fi in that they were all recorded in Paris in the late '30s and throughout the '40s. This is important music, however, so it is a very worthwhile addition to a jazz collection.
Some other great - and more modern - Stephane Grappelli recordings are "Young Django," a 1979 Verve recording in which Grappelli is joined by guitarists Larry Coryell and Philip Catherine along with bassist Niels Pedersen and "Oscar Peterson Featuring Stephane Grappelli," a 1973 Prestige recording in which Peterson and Grappelli are joined by Niels Pedersen on bass and Kenny Clarke on drums.
Some other great - and more modern - Stephane Grappelli recordings are "Young Django," a 1979 Verve recording in which Grappelli is joined by guitarists Larry Coryell and Philip Catherine along with bassist Niels Pedersen and "Oscar Peterson Featuring Stephane Grappelli," a 1973 Prestige recording in which Peterson and Grappelli are joined by Niels Pedersen on bass and Kenny Clarke on drums.