Well this worked multiple times for me.
First find an item thats a blue put it for about 50g and put it in the ah on another character make sure yours is the only one there and make it around a twink level blue
Second go to the ah find an epic
Post it general chat saying that your selling it
Then when the person p.ms you , let them offer then you say fine or
something to that matter then say but Im really looking for this [give them the link to the item you put in the ah] and say its for your twink and it has a very low drop rate, tell them if you can get hold of this item I will give you the epic for it and you just have to give me like an extra 20g
Make it seem like a really good bargon to there advantage so it seems like your getting ripped off but little do they know there getting gipped because it was your multi that put up the item for a redicioulse amount and there just buying it out and not gaining anything then when they say ok i got hold of the item.Log off and 90% they bought out your auction give it a few tries not always works
Have fun!