https://www.sendmeasample.net/heineken-zero-point-zero -register and install either the Alexa Skill or the Google Assistant Skill here(depending on which voice assistant you use).  Once you do that, say “Ask Send Me a Sample for Heineken  0.0” and go through the steps to request it.  If you want to use Alexa, you can download the Amazon app here. It should show up in your order history here when you’re done.

https://www.wemaketheworldloveliquorice.com/ -scroll down, fill out the form, and select the “I need a sample by mail” option to get a Free Lakrids by Bülow Licorice Sample.

https://app.sampler.io/anydayisfryday -register or login with your Sampler account for a chance to get Free Sir Kensington’s Mayonnaise and Ketchup samples, and a coupon for a Free bag of Alexia Fries.

https://whisps.com/pages/samples# -fill out the form to get a Free Whisps Cheese Crisps Sample.

https://www.sendmeasample.net/neonzebra -register and install either the Alexa Skill or the Google Assistant Skill here(depending on which voice assistant you use).  Once you do that, say “Ask Send Me a Sample for Neon Zebra” and go through the steps to request it.  If you want to use Alexa, you can download the Amazon app here. It should show up in your order history here when you’re done. 
–Update– these send me a sample freebies seem to keep going out of stock, but there are some available at the moment.

https://murrayriversaltusa.com/pages/please-request-a-free-sample -fill out the form to get a Free Murray River Salt Sample.

https://www.intheraw.com/shop/sample/ -fill out the form to get a Free In The Raw Sweetener Product Sample.

https://www.theamazingchickpea.com/free-sample/ -fill out the form to get a Free Amazing Chickpea Spread Sample.

https://skinnyjoecoffee.co/? -fill out the form to get a Free 2-Day Skinny Joe Coffee Duo Sampler.