The most important thing to note is that Amazon does offer a 30-day free trial for any new members. You can cancel your membership without being charged, as long as you close your membership before your first payment. If you've previously been an Amazon Prime member, you won't be able to get a free trial with that same account.

Prime Day sees some pretty tempting deals and discounts on science gifts, but is it worth waiting for Black Friday to potentially save even more?