The feat "Got the Worlds on a String" for fortifying the Cosmic Shaper's Necklace to level 40 is incorrectly granting a discount on the regular Martian necklace from the ARGUS Special Requisitions vendor, instead of granting a discount on additional Cosmic Shapers Necklace from the LexCorp Drone vendor.
The feat description says "Completing this feat unlocks a discount on Cosmic Ingots, Figments of Imagination, and Gaussian Folds." Perhaps it's not even supposed to give a discount for OP necklace? Though it would be nice. I don't see a discount for regular Martian necklace or anything else, however.