BobbyZ, a couple of years ago I found Quadromania (a 4 CD set) in my local bookshop. It contains recordings made between 1947-54, many of which I didn't know, including 4 of the tracks with Coltrane + Hawkins ("recording dates unknown") - Off minor, Epistophy, Well you Needn't + Ruby my dear. The 4 CDs cost . . er . . £6.99.
I bought a few of the classical
Quadromania sets a few years ago. Last time I was in MDC at the South Bank they had lots of them from several categories, including jazz. It might be worth giving them a ring to see if they still stock these very cheap box-sets.
http://www.mdcmusic.co.uk/shops.htm