going on past sales, between 200-300 depending on year of build and wether the 2010 ones have had the all important upgrades
condition will play a big part of the price and finding a seller who has the pressure tester will always be a bonus too.
I just paid 220 for a NT11 with pressure tester and all accessories + more
Awesome guns if your mate has the time to understand them and has a good techy knowledge