My wife signed up with http://startsampling.com/ (IIRC thats the name) and after a couple years now we have a large bag of product samples we pack in our suitcase and take with us. If we do like one of the products and buy a regular size I've found a lot of the small travel sizes can be refilled.
I forgot to mention that if your having a baby or know someone who is sign up at places like huggies and pampers and they send all kinds of samples. We built our travel/bug out bag for our newborn son from those. We received several cans of formula, which I keep with bottled water if something would happen to my wife and we would have to give him formula.
I registered my own domain name so I can make up as many e-mail alias' as needed for when signing up for things I can make a new alias for each and tell who is selling the name.