I can imagine asking alexa "whats the best 2 man tent on the wirecutter; order it for me, delivered to work by Friday"* Do you think the technology will get there anytime soon?
*other review sites are available
I was going to try and dazzle you.
I don't think Amazon provides a hook to do orders (although you can reorder past purchases on Echo through Amazon), and I don't know if they have a checkout type api orders could be routed to externally.
Good idea for a skill. One potential issue is the products would be limited to a vocabulary of around 50000 items because of the way the NLP works (custom slot type), so it might work best for product niches.