INO - Extreme Markets
If you believe that GBN.V shares are somehow inverse correlated with the bond markets, this is precisely what you would want to see getting up in the morning. I managed to catch this quote just before the rest of the quotes filled in:

source: http://quotes.ino.com/analysis/extremes/futures
Have a look at Bloomberg: http://www.bloomberg.com/markets/rates-bonds/government-bonds/us/