Yes,  Most of our cabinets can be ordered as Cabinet Only.  Currently, any unit in the following collections is available this way:

Any cabinet that doesn't allow a top selection or states Married Top in the description would not be able to be ordered without a top.

All of our cabinets arrive with wooden "risers" screwed into the tops of the cabinets in order to accommodate our 4cm Laminated stone tops.  If you desire to use a different thickness of top such as 2cm or 3cm, these risers will need to be removed.  Simply unscrew them from the top of the vanity and discard.  Your tops will rest directly on the top of the vanity cabinet.  If you are going to use a 4cm Laminated top (either ours or one of yours), the top will fit on top of these risers allowing the lip of the top to rest at the top of the vanity.