Lets you trade 5 of a daily random reagent for 20 Garnisonsressourcen. 4 hours cooldown, meaning you can get maximum 840 Garnisonsressourcen though this channel per week. This is the same as for a Sägewerk Stufe 1, but with the Mill you can potentially ingrease the yield if you get Phylarch der Immergrüne.
Spotted Talgaiir der Eisenberster there, not sure if he's the only vendor there or if there's a rotation.
If you have a lot of gold to burn, you can convert your gold into Garnisonsressourcen with a Handelsposten Stufe 1 (or higher).
Buy cheap mats on the auction house (be quick as it clears out fast!), and use work orders to trade them for 30 Garnisonsressourcen. It changes per day, so have room to bank surplus as you wait for a trade to be available.
Best for Fish/Leather: Rippenkauer (Horde), Krixel Quetschpfeife (Horde), Krixel Quetschpfeife (Alliance) and Talgaiir der Eisenberster (Alliance) with the fishing items and Rohes Tierleder at 20 Garnisonsressourcen.
Best for Ore: Händlerin Yula (Alliance) at 20 Garnisonsressourcen.
Best for Herbs: Pyxni Groschenhort (Horde) and Pyxni Groschenhort (Alliance) at 20 Garnisonsressourcen.
Best for Meat: Krixel Quetschpfeife (Horde) Krixel Quetschpfeife (Alliance) with the Meat items at 20 and 25 Garnisonsressourcen.
Best for Enchanting/Cloth: Pyxni Groschenhort (Horde) and Pyxni Groschenhort (Alliance) at 20 Garnisonsressourcen.
Best for Chamäleonlotus: Händler Portanuus (Alliance) at 20 Garnisonsressourcen.
All work orders are a daily random item (It is possible for the same item two+ days in a row, but I have not seen it yet.) and give out the same amount of Garnisonsressourcen per work order(30x).
Even though you can build the Level 2 Trading Post by 92 with Bauhinweise für ein Außenpostengebäude. You can't unlock the quest for the Auctioneer until 96. Was a little bit of a disappointment for me.
The lowest price for a good is 4 Garnisonsressourcen, with the "worst" price being 10 GR. Each side has a "break even" trader, who sells all goods for 6 GR (Portanuus & Tai'tasi). One profits on any price below 6 GR, and loses on anything above; hence, the "break even."
Ore includes both ore types, Herbs include all the herbs, etc. Meat is the raw meat and egg, while Flesh is the fish flesh (pretty self-explanatory). They all sell the Geschmuggelter Goldbeutel and Blutiger Goldbeutel for the same prices.
The level 2 trading post doesn't come ready made with an auctioneer like the storehouse comes with an NPC for your bank. Once you complete the building and upgrade it to level 2, you'll need to complete the quest Teileauktion , which will either be vastly time-consuming or pretty expensive (it used to be 100 to 150k), depending on your situation. The objective of the quest is to grind, raid, and pvp all over Draenor to procure all the parts to 'build' your auctioneer with an assortment of modules.
The lesson here, which no doubt you have also learned by now, is that when you're planning your garrison, you can't always rely on building tooltips, or guides for that matter, to tell you the full story. Now that you are informed, you may decide to go ahead and build your trading post and do Teileauktion to get your auctioneer. Please read the quest and the comments carefully, open a spreadsheet and price everything out on your server before undertaking this. Note: From my analysis, the prices on components vary widely from day to day. Something that is 187% one day can be 36% the next day. If you're ready to do some grinding, I'm sure it's a fun challenge and enormously gratifying.
I wasn't able to find the trader, then realized why. The work orders NPC (for Horde, Fayla Fairfeather), has the quest Das A und O des Handelns/Das A und O des Handelns, easy quest, you go out, give a drink to the daily Trading Post trader (who is out sleeping on the job!) and once you turn the quest in, the trader shows up in your Trading Post.
Der Handelsposten ist das Zentrum des Handels der Garnison mit den Einheimischen Draenors.