Amazon offers the Braun Series 7 70S Cassette Replacement Pack
(formerly 9000 Pulsonic) for $28.85. Order via Subscribe & Save to cut it to $27.41
and bag free shipping
. That's the lowest total price we could find by $5. It fits a variety of Braun Pulsonic and Series 7 electric shavers.
Be sure to cancel Subscribe & Save after your order ships to avoid being billed for subsequent shipments.