I'd take a look at QuickAuctions3 aka QA and/or QA3.
It will allow you to setup groups of anything you want, with minimum/maximum numbers to keep at xx price on the AH at any given time. Pair that with it's ability to undercut, have fallback pricing and all sorts of other features, you just can't go wrong.
The one drawback.... There's a slight learning curve involved to get your pricing/stack sizes/durations etc correct for how you want them to be. But well worth the time involved to learn it.
http://www.wowinterface.com/download...Auctions3.html