Just to add my two cents...
I'm not a Disney expert but during our initial research for our trip Dec 2009, we couldn't find a lot of discounted ticket options either. The guidebook we used, Unofficial Guide to WDW, pretty much confirmed this and indicated that best discounts are generally thru a broker like Undercover Tourist. And as mentioned, Mousesaver's monthly newsletter has a code for a little bit more of a discount at UT.
We had some concerns about buying a few hundred dollars worth of tickets thru UT over the Internet sight unseen since we hadn't heard of them before we started researching. But there were good reviews on them and the tickets arrived in a timely manner & validated no problem at the gate.

There are some other ways to get cheaper tickets (ie. e.Bay, etc) but we felt the increased risk wasn't worth the discount. We also looked into BCAA/AAA but our local branch only sold Disneyland tix. And the prices at the local Disney store weren't a deal.