Some people price N&B high on Engi, but it's still a cancer effect.
 
I would guess It's about 3-4 or something. But you shouldn't trust anyone but Faron/Rvsz, they're Skial's trading nerds.
 
My personal opinion is that NB is shit and low-tier either way. But regardless, the going rate for NB's on engi is high. 6~