I usually keep 100 or so Feather DE blades in the house.My husband & I both like them. But looking at other responses, I see that I am an amateur.
I have 20 - 200 blades. When I get down to 20 blades or so, I order one or two 100 packs of blades. Ordering blades this way saves money without straying into hoarding territory.
Unlike most here, I only have enough blades to last a measly few hundred years. I did find you get a better price if you buy your blades by the pallet. Make sure the delivery truck has a lift gate so you don't have to break pallets down on the truck. tp