Tyr's Hand (marked RED on the map) - One of the Scarlet Crusade's Bastions, the Tyr's Hand is located in the south-eastern part of the Eastern Plaguelands. Scarlet Crusade members that can be encountered there have a very good Loot Table. The main focus here will be the Scarlet Archmage (which is an Elite, so farming them solo might not be possible for some Classes). the Archmage drops a lot of Runecloth, ~14 Silver worth of Pocket Money on average, and most importantly, the Formula: Enchant Weapon - Crusader which is very valuable to all Enchanters and achieves really high prices on the Auction House. Mobs encountered in Tyr's Hand can be Pickpocketed, so this is a quite good spot for experienced Rogues. Recommended Level - 60 (some Classes might be required to find a Farming Partner and go in as a duo).
Thalassian Base Camp (marked BLUE on the map) - Some Blood Elves have set up a camp in the northern parts of the Azshara. Blood Elf Reclaimers and Blood Elf Surveyors that can be encountered in the said camp are rather easy to kill and have very good Loot Table. The most notable items dropped by those Elves include Runecloth, Mageweave Cloth, 16 Slot Backpacks, various Vendor Trash Items (junk weapons, armor, and so on), and Pocket Money. They can also be Pickpocketed, so this spot presents an additional value for Rogues. Blood Elf Reclaimers have access to strong Fireball, Heal, and Renew Spells, so they should be interrupted when possible and prioritized. Recommended Level - 52+ (54+ to be extra safe, and farm Elves at an increased pace).
Check Item's Vendor Price before posting it on the Auction House - Selling items on the Auction House below their Vendor value is a common mistake. Avoid it like fire, and always make sure that you are not losing Gold on your Auctions. If you plan to sell an item on the AH for a price just a tiny bit higher than its Vendor value, you might be better off just vendoring the said item (this will allow you to avoid the risk of losing an Auction fee if your Item doesn't sell).