Memorial Markers can be purchased from outside monument companies. You do not have to buy from the cemetery. Ask your local monument company for a cost before committing yourself to the cemetery.
Many cemeteries charge a variety of fees for installation of the monument, perpetual care, maintenance, and other add-on services. Some cemeteries will tell a customer that they are the only ones who can install a monument, that installation costs are part of the lot price or that since your family member is buried in our cemetery that you have to purchase your monument from them. This is ILLEGAL. Ask questions before you buy a cemetery plot and be sure you receive satisfactory answer