This is maybe the funniest commercial I've ever seen paired with one of the most genius marketing strategies of my time. I can personally attest to the frustration of buying overpriced razor blade refill packs. I usually wind up buying those massive refill packs at Costco to save a few bucks.
The razors are generic brand overstock the company probably purchases at a steep discount, but it appears that customers can count on getting the same blade each month, since what they send is a blade refill to go with the free handle delivered upon enrollment. They are not one-piece disposable razors.