Who has the lowest fees for municipal bond trading on the secondary market?

Answer 1

I've been told that Merrill Lynch actually has the best muni bond spreads (brokers don't usually charge fees for bond trading, they just mark the price of the bonds up to make profit.)

You could check here for more info.
http://www.bondmarkets.com/
Also http://www.municipalbonds.com/

I think AG Edwards may be another good place to look, as well as online brokerages. Get competitive quotes on yields for comparably rated (AAA or AA for example) munis, and do more research, you may find a lower rated bond that could get upgraded and the value of the bond could go up.

Good luck