User blog comment:ILYx3/Need advice on my 100kx/@comment-1242640-20111025003138

If you want GP, weapon sellback is really the best option as of now. Either buy NX weapons and sell them back or earn them from a MYST/Hi-Sec case and sell them.

Speaking of Hi-Secs, you can get a bunch of 200% passes from those, with the chance to get permanent items and stuff you can sell back.

Otherwise, you shouldn't really buy anything that's not permanent. If you're lacking a weapon in a certain category (i.e you don't have a good SMG or Sniper), then buy one for perm.