Yes, there is a free web site to query bond online realtime price information try url click real time price tab use this page to search bonds url

Are bond prices available online in realtime?

there is a new professional web site to provide bond yield real time data please try url click real time price tab

European bond yields- real time?

there is a new professional web site provide corporate bond information and optional adjust spread, and its own version credit grade model spread url

Bond Prices and Yields, where to get them?