When you place an order, there's a $2,500 deposit that locks you into a price and configuration. But you can change your order or back out within a week if you change your mind or, this is key, Tesla makes changes on their Design Studio that would be desirable. Here's one scenario (as of mid-November): 1. You're interested in a 100D 2. You want free lifetime SuperCharging (order before 12/31/16, deliver before 4/1/17) Process: 1. Place an order for a 90D ASAP for delivery ASAP 2. In 6 days, if no 100D or other desirable changes are available and the date is <12/31 and prices haven't gone up, cancel your order and go to step 1. 3. If within 6 days, 100D or other changes are orderable at desirable prices, change your order (Tesla may do this automatically) and smile. Otherwise, either go to step 1 or let your order go thru. 4. If your current order is within 6 days of 12/31, and you're hell bent on a 100D or some other speculative changes, request a more distant delivery date, but comfortably before April 1. You'll need to pay $500 plus any price changes to modify the order, but this may give you the option of getting what you want. Otherwise, let your order go thru. This assumes that Tesla will let you cancel and then reorder the same day. If not you could have your spouse do it. You could even stagger two orders to narrow the cancellation window. Does this make any sense?