This online store,
Minimus, sells travel- and trial-sized products. I think I even dicovered them through FT.
Link goes to the personal care products section. There is also a pharmacy and other departments. Some products are just mini bottles, jars, and tubes, but others are packed in small sample-type packets, which might work.
For example - a one-time use packet of
Freshscent Hand and Body Lotion, 17 cents for a 1/4-ounce pack (obviously the idea is to buy multiples...).
I'll bet some of the frequent flyers here on FT probably have more mini products in their personal collections than the store's entire inventory, LOL
.