Blizzard Representatives have hinted that Patch 2.3 will introduce a new Field Repair Bot that will sell many necessary goodies such as healing/mana pots, scrolls and reagents. You can give it a try when Public Test Realms (PTR) become available.
Bornakk: Gan’arg Analyzers in Blade’s Edge Mountains stumbled upon plans of a new Field Repair Bot and are hoarding them for their own purposes. Anybody plan to investigate this in patch 2.3?

Drysc: The repair bot will sell all reagents, level 65 arrows and bullets, poison reagents, few types of vials, up to 2 super mana/healing potions, and maybe some scrolls. These are all for sale, with no rep discount, because he’s a robot.