This is the same as in Tucson. Right before I left I saw a couple ads for the 16GB WiFi only model, at $600. This was worse on launch week, when that same model sold for over $900.
As some point out, the waiting period might be the difference in price to some people. Also, I remember you had to pay with a credit card to get it right? I remember that story about a woman that saved for an iPad but was denied one because she wanted to pay in cash. (If you want to know what happened, her story was featured in some news site or news show and Apple gave her a free iPad and started taking cash for them at the Apple Store).
I just don't remember if that policy is still good.