https://www.sendmeasample.net/chomps/   -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 Chomps” 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 –  still available, you should be able to claim it without the voice assistant stuff if you go here after logging in.