I recently bought some "cheap" underwear at Walmart. I really don't like Walmart and avoid going there but I decided that underwear lasting for a decade or longer is just too long. So I'm intentionally NOT doing BIFL with underwear, socks and other things. Because it just seems cleaner and healthier to replace that stuff more often.

With many things I do prefer better quality, BIFL-class products:
LEDs are a much better value even than CFLs bulbs and incandescent are actively eliminated in my house.
I have a Deere mower that seems like it will never die.
Corelle dishes seem to last forever, I have had many of mine for 30 years.
Victorinox knives (pocket and chef's).
KaBar and Morakniv knives.
Kohler plumbing fixtures.
Rotel or McIntosh audio equipment.
Vitamix mixer.
DeWalt, Makita, Craftsman, Milwaukee, Husky and Hitachi tools.
Deckmate or stainless steel screws for outdoor use.