Ridiculously expensive

Although quick to come out after I had sent an enquiry online requesting a quote, which I didn't receive upfront, they then invoiced me caR9k for a Centurion garage door motor which retails at about R3,2k. When I asked why such a big difference, they say they had to pay extra to ensure they can guarantee me the item for 3 years. Please insist on a quote upfront because these guys will take you to the cleaners with their prices