Just a tip for my fellow engineers
When wotlk started i tried it and noone seemed to be interested
now i made another attempt and it seels like hot donuts
What im talking about is Ammo
Ultrasafe Bullet Machine
Use: Creates 200 Mammoth Cutters.
Ultrasafe Bullet Machine - Thottbot: World of Warcraft
Saronite Arrow Maker
Use: Creates 200 Saronite Razorheads.
Saronite Arrow Maker - Thottbot: World of Warcraft
i sell in both cases the ammunition i gain from the crates -hunters will most likely look in the ammo section and the price for listing the ammunition is cheaper than the price for listing the crates
both seem to sell really well, profit might vary between 6-21g per 1000ammo Stack . Also for Ultrasafe Bullet Machine take a look into the AH for the Ingredient Volatile Blasting Trigger -that stuff can be found from several mobs in ulduar an people seem to have no use for it -eg you can buy it dirt cheap from the ah and thereby increase your profit
Experience comes from 2 Servers one alliance side one horde, can't guarantee that your server provides the same margin tough.