Hello aspiring scribes of NPC!
As of today, NPC has unlocked all the schematics you need to level to 400 the cheapest way according to gw2crafts.net, with one exception. That exception is we have unlocked Emergency WP instead of Gate Turrets. Please consider using Emergency WP to level instead. The difference in gold is 20 silver per craft (so approximately 5.6 gold total difference), and the turrets are awful in WvW.
The only other thing is you may have to make guild arrow carts instead of ballistas (the price difference is coppers).
Let me know if you have any questions!
Happy scribing!