Sony has recently issued one of their cheap boxes with all the Jean Martinon/CSO recordings. Much of this material has never been on CD before.
For me, Martinon's own Symphony #4 and the Roussel Bacchus suite are worth the price of the whole set. I have the symphony on vinyl (good condition, too), but I can't recall ever seeing the Roussel except somewhere in a library, and as I recall, it's a knockout performance. The symphony's original diskmate, Peter Mennin's Symphony #7 (a fine piece!), turned up on a CRI CD, but I'd long since lost hope for the Martinon reappearing.
I think Martinon was really underrated here in Chicago. It was a difficult time, with the orchestra unionizing and political stuff going on with the Tribune's critic. But looking back, and listening, Solti on his best day wasn't a third of the conductor Martinon was, and can anyone name a Barenboim/CSO recording that will be as revered as almost anything by Fritz Reiner?