Exchange Traded Debt buying, like, understand, anything, exchange

Mechanic

Info:
Exchange traded debt, i.e. ATT (AT&T senior notes), are a great, cheap method (much cheaper than buying bonds through your broker) of adding fixed income securities to your portfolio (obviously, like anything else is finance you need to understand the details and do your analysis).

Question:
1. Where can I find a listing of all exchange traded debt; preferably for free and besides quantumonline.com?