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Online sites for real time bond prices
Bonds are extremely illiquid and have traditionally traded in bulk.  This has changed in recent years, but bonds used to be traded all by humans not too long ago. Currently, price data is all proprietary.  Prices are reported to the usual data terminals such as Bloomberg, Reuters, etc, but brokers may also have price gathering tools and of course their own internal trade history. Bonds are so illiquid that comparable bonds are usually referenced for a bond's price history.  This can be done because non-junk bonds are typically well-rated and consistent across ratings.