Since we were already talking about great sample sites another fantastic site is https://www.pinchme.com/
#PINCHme is unique because they offer samples and free products on Sample Tuesday, which is held every second Tuesday of each month at 12:00 PM et. It is great because if you qualify you can fill your sample box with various free samples and when you receive them all you have to do is leave a review of the products you have tried.
I have to admit that one of the most exciting parts of #PINCHme is their unboxing events they hold on facebook live to showcase what samples and products that will be offered that month! https://www.facebook.com/PINCHme/