I used to know one of the Lehman Subordinated Bond Symbol and it was trading at .01 when the CTS were trading at .05.
I know with my Broker one has to invest a minimum of $ 5, 000. to buy bonds - plus the Lehman Bonds could not be traded through my account but only directly through the Broker which did not make them as easy to trade as the CTS.
I'll do a search and try to locate a Subordinated Bond Symbol for you.