STOP
If your server is anything like mine there not a lot to lose by doing this. Right now everyone is trying to get rid of their Northrend stuff, so prices have dropped to 2-10% of what it was a month ago. So don't bother undercutting, but take a chance and wait.
Why? Simple...right now supply is high and demand is low which causes prices to drop. Noone needs those eternals or frozen orbs right now. So I suggest keeping em for a while and wait for the following.
- Wait for a better AH moment.
When everyone else has sold their stuff there won't be many people offering stuff, but there will still be a "low" demand for stuff because of leveling alts. Selling your stuff then will allow you to price it higher.- We'll be making a lot more gold in Cata so prices on AH stuff will go up. We saw this in previous expansions too.
These two factors are likely to get you more than 2 gold for that eternal.
I can't garantee that you'll get more gold, but just look at some of the prices right now. For some items they are just hovering over vendor price. For these items there is pretty much nothing to lose. If you don't want to take big chances only apply it to these items and AH the rest now.
Happy auctioning!
Warning:
The waiting does not work with epic gems! Since they can be replaced with better green cata gems. Get rid of these NOW!