Which option do most offices pick?
Rental. It is the pick for most buyers. You make one regular payment, service sits inside the same arrangement, and nothing large leaves the bank on day one. When the term is up, step to a newer model or return the machine. New, renewed and refurbished copiers all rent on that basis.
Paying cash costs the least across a long working life, provided the money is there and the machine will stay for many years. Would your accountant rather see a lease, or another form of finance? Either one can be arranged.