Good price - Philips OneBlade Replacement Blades for All OneBlade and OneBlade Pro Models (Model QP250/50) (Pack of 5).
CamelCamelCamel.
They last a pretty long time, weekly use mines just starting to go after 2 years.
Mine has lasted years too. I only use it for trimming though, I don’t do a full shave with it
I get ~3-4 months of comfortable facial use from each blade trimming a full-coverage 4mm beard an average of 2 x per week. I then cycle that duller blade for pubic trim at 3-6mm (fade pubes from 3mm at trunk to 6mm up pubic area), which lasts ~6 further months doing so 1 x per month.
Seems to be the most efficient use, but open to other ideas.
I'd say 4 months of shaving every second day.
They still 'work' and won't cut you after that but they really slow down.
I use a Phillips Multigroom (MG570) for trimming facial hair and the OneBlade for shaving/shaping the neck line.
Have found this greatly reduces the number of blades I go through a year.
this is not 360, so it won't adjust to the body
I don't think it's a big deal. They're still spring loaded back to front to follow contours.
How long do these typically last? (yes 'how long is a piece of string') but curious the milage for people.