Cupholders I have known

'97 thru '99 Boxsters came with no cup holders.

Here are some I've seen that can be added.

Used to be available via Performance Products, not sure if it still is.

also Performance Products

Made by Byrd Automotive. available through Performance Products and others

Not sure who still has this one. It is removable/.

Cheap!!!! Piece of styrofoam cut to fit and removed when not used as cup holder to be stashed behind the passenger seat.