Charity shops. I buy loads of CDs and cassettes (rarely LPs these days) from them. I occasionally buy new from Coda Music, the Edinburgh folk specialist, but I'll buy 20-50 second hand CDs for every new one. I get lucky with interesting stuff here; some of the more recent things I've bought have been Byzantine chant by Sister Marie Keyrouz, Mexican field recordings on the Airmail Music label, piano music by Douglas Lilburn, a mountain of cassettes of Brahms chamber music and compilations of Miles Davis and John Coltrane at 3 for 50p, ud music by Munir Bashir, French accordion by Danielle Pauly...

But I buy new when on holiday abroad - on most trips to Turkey I come back with a pile of local music a foot thick.