Nope, no way whatsoever. If after 4 days it's still processing (I think it's still 4 days?), you can cancel it from your orders page. Just hover the mouse over the word "cancel" and it'll show you how long until it becomes a link that actually lets you cancel it.You can always send a message to the vendor and hope they aren't busy enough to notice, but... that's kind of hit or miss.