I already pre-ordered mine. Sprint stores, as well as Best Buys and Radio Shacks are already taking pre-orders. (started Thursday). Best Buy and Radio Shack are the best deals because they will take care of the rebate for you, so you only have to pay $199 up front and not wait for your $100 back 2 months later.
However, most Radio Shack stores don't have a clue that they are even able to order it yet, but yes, they can. You just have to find one that knows WTF is up. I suggest doing Radio Shack because they are offering $20 in free accessories (via gift card) if you make a $50 deposit. So... that's basically a free charger, case, etc....