Shame the shipping is more than the blades from that site - just under £16Kamisori (blade from the OP) are still available here:
Silver Blade & Tanken Refill Blades - KAMISORI INC.
Blades are packed in their own injector-style dispenser for fast, easy, and safe blade installation and convenient storage. The package has a safe disposal slot for used blades on the bottom.www.kamisorishears.com
As for the Dorco blades, I'll wait for the Maggard's reply.