We'll know soon, but I'm going to venture a guess that the discount in question is on:
Warp Coils, Self-Sealing Stem Bolts, Entertainment Provisions, Seismic Stabilizers, and Terraforming Systems. Those commodities are not discounted anywhere, not even on the Tuffli*
*I'll have to double check, but last I knew that was still true about the Tuffli.
(It's like I shopped around for these things)
Good guess - I can see this. Something I've been wondering for a long time, does the Lobes discount apply to the Tuffli quartermaster?
And, to stay in on-topic, as another poster asked, will the Lobes discount apply to this commodity vendor?