As with the 911 the Boxster softop remains on the car when you install the hardtop. You just lower the softop and then install the hardtop. IIRC the Boxster S hardtop runs about $2250 if you buy it as on option on a new order (the 911 hardtop is no charge). You can usually find a Boxster hardtop used (they're interchangable on all model year Boxsters) and all you'd need to install would be the spin-locks which a Porsche dealer can provide if they don't come with the used top.