If you had provided even the most basic of information, perhaps we could have helped a bit.
- is it a Rem barrel, or something else threaded for the 700?
- you said it's "brand new" (meaning it has no shots through it), but is it "take-off", or never mounted?
- length?
- chambered in? 7mm-08, 7mm Rem Mag, 7mm STW, 7mm RUM?
- twist rate?
- fluted?
Rem 700 "take-off" barrels generally go for up to about $150. I have paid as little as $50 and as much as $125.