I shave w/ Derby Extra blades, $10 for 100, but was shopping for something new. Discovered Derby Premium for a similar price, but a 2-pack (200 blades!) was on sale for $14. At 1/week this is a 4-year supply. At my rate I won't need blades again until my son is in college.
@owingst Yeah realistically I only change blades every two weeks or so myself, and that's with Extras. I hear Premiums hold their edge even longer so I really do think I'm set until the 2030s.