I need to know if I have to pay at once or I can go for a monthly payment for
the car I buy on CarGurus? Please provide a comprehensive description on my
question. FYI i want to go for the monthly payment option
CarGurus doesn't finance cars, it is just an advertising site. It is up to the seller or dealer but most will want full payment before releasing the car. If you need financing, it is better for you to go to your bank or credit union to see how much you can borrow and how much the payments will be.
Check out AutoPay. Most if not all car dealers can help you with financing.