Here are a couple samples you can get, if you’re a Sam’s Club or Costco member.
You’ll need to have you card numbers handy.
Sam’s can get free Purina One dog food.
(If you’ve done it before, you will probably be able to do it again. I did.)
There are two samples available at Costco, Sensodyne & Fekkai haircare.
I had already requested the Sensodyne and couldn’t do it again.