As long as you order by today, you should qualify for the rebate. Gateway's order statement (your receipt) has the order date in the upper right corner. The ship date is listed by item next to the tracking number, I doubt they'll even notice it. Of course if you want you can see if your local compusa has it in stock and buy it there for 149.99+ tax - 50MIR. Could be easier than worrying about it coming from gateway in a couple days...
Memnoch