Probably not relevant to most here.
I don't have a Prime account (most discounts and advantages are irrelevant to IL usage). I usually activate a trial about once a year for Prime Day sales I like, or for example, during my trip to Chul. Was ordering a $20 product to send to Monsey, and decided to spend $4 on shipping instead of another $15 to get free shipping. On the checkout page, they offered me a one-week Prime trial for $2. This was cheaper than shipping so I took it. When I went to cancel immediately after the order (intending to set an automatic cancel when the trial ended), they offered me the option to cancel immediately for a $1.09 refund. This made more sense, so I accepted.
Total cost: ~$21 and 6% back (Amazon Prime card+Amazon day delivery) instead of $24 and 3% back (Amazon regular).