I’m convinced you can buy *anything* on Amazon.
Just for fun, I looked up ‘casket’:
https://www.amazon.com/Star-Legacy-Prestige-Poplar-Casket/dp/B00D4ACY20/ref=sr_1_3_a_it?ie=UTF8&qid=1472734885&sr=8-3&keywords=casket
We joke that if you can’t find it on Amazon either no one makes it or you don’t really need it. They do seem to have everything.