Why a store, not a single brand
No single maker stands behind the range. New machines come from Toshiba, Kyocera, HP, OKI and Lexmark; secondhand ones can be any major brand at all. So the advice starts with your office, not with stock that needs to move.
Sometimes that means refurbished over new, A4 over A3, or black over colour. Whatever the answer, every figure goes in writing, running costs included.