I believe that you can cancel the one you don't move forward with, and forfeit the $100 only. Not giving legal advice, but that has been my experience in cancelling these before, and is also what the order agreement you have a link to appears to provide. See the language below. Note, I am not sure why the cut and paste has the odd characters in it, but you can read it ok I think. Also, note that if there was a transportation cost, that would be in addition to the 100, but for a new car that doesn't appear to apply:
Order Process; Cancellation; Changes. After you submit your completed order, we will begin the process of preparing and coordina1ng your Vehicle delivery. At this point, you agree that any paid Order Fee, Order Deposit and Transporta1on fee have been earned. If you cancel your order or breach this Agreement and we cancel your order, you agree that we may retain as liquidated damages the Order Fee, Order Deposit and Transporta1on Fee, to the extent not otherwise prohibited by law. You acknowledge that the Order Fee, Order Deposit and Transportation Fee are a fair and reasonable es1mate of the actual damages we have incurred or may incur in transpor1ng, remarke1ng, and reselling the Vehicle, costs which are otherwise imprac1cable or extremely difficult to determine. If you make changes to your order, you may be subject to poten1al price increases for any pricing adjustments made since your original Order Date. Any changes made by you to your Vehicle Configuration, including changes to the delivery loca1on or es1mated delivery date, will be reflected in a subsequent Vehicle Configura1on that will form part of this Agreement. The Order Fee, Order Deposit, Transporta1on Fee and this Agreement are not made or entered into in an1cipa1on of or pending any condi1onal sale contract.