There aren't many things I'd commit to saying I NEVER buy, but I buy many things RARELY!
One thing I would not purchase when my little ones were babies were throw-away bibs! My cloth ones work just fine! And somehow bibs just seem to multiply anyway.
On the RARELY buy items:
haircuts (once every two years for me...DH can trim in between)
cookies
razors (disposables last FOREVER)
nail polish remover (nail polish for that matter)
make-up (Yes, I am a rare female.
)
purses (again, rare female. I've had the same purse for 8 years and it pretty much just sits in my car)
bottled water!!!!! I can't say I NEVER buy this, but I take great measures to avoid needing to!