Generally ordering directly from Moab (as apposed to Adorama or Inkjetart) is more expensive and slower.
Yeah, that is usually true with a manufacturer. The manufacturers can't undercut their dealers, so they sell at list.
I bought quite a bit of discontinued paper for everyday proofing.
They are relatively small though. Give them a call. They might be able to find stock. Worst case you could ask them to check production schedules.
I also just bought a bunch of Entrada in smaller sizes for portfolios. Some regular, some pre-scored and drilled. Are you using double sided? Cutting it down?
Best,
Michael