Apologies, I forgot to include the link to the CME group where you can find current (real-time….delayed by I think 20mins) DV01 for treasury futures products.

http://www.cmegroup.com/trading/interest-rates/invoice-spread-calculato…

P.S. Trading the NOB spread is a "boring" trade; you will not get any "quick" kicks from it because it's not subjected to the wild swings as when trading the outright, but you will be satisfied (as long as your timing and discipline is right).