The price listed at the end of this customization is only an estimate on what the final cost will be based on the Retail Pricing of the selected components, plus a $25 service fee. Once you've made your selections, go to checkout and select the "invoice" payment option. That will place your order without having to pay ahead of time. I will evaluate the total cost of the selected components and labor and then reach back out to you with the final price. The cost of this service will never be higher than the estimate, aside from the event that preexisting damage is found in a provided controller.