I just found this out recently, and I'm not sure if it's nationwide or just in California.
If you go to the AAA website (aaa.com will direct you to the proper local site) and click your way to Retail Discounts, there's a nice, long list of merchants that offer discounts. Hasbrotoyshop.com is one of them, and the discount is 15% (better than most of their sales, which are 10% off).
You have to click through the AAA site. And double-check the total in the cart. For some reason, it didn't seem to "take" the first time, and I had to go back to aaa.com and navigate back to hasbrotoyshop.com. (Thankfully, it kept the stuff in my cart.)
Of course, you have to be a AAA member to get the discount.