Actually, if you're using those for shipping--which is the only thing about Prime I'm interested in given how much I distrust and dislike Amazon--I accidentally discovered an even easier way to exploit them.
If you add something to your cart, then go to check out, you can accept the free Prime period, select Prime shipping, then remove the free Prime trial from your shopping cart before you pay and it will just...keep the Prime shipping on the order.
The first time I did this I was convinced I had fucked something up because I went to cancel my free trial after the item I bought had been delivered and instead of having the option to cancel I was given the option to start another free trial. The second time it happened is when I caught on that I was on to something, and I then tested it again and it just...worked. I'm sure they'll fix it eventually, andit's probably totally useless if you like other parts of Prime, but if you want free 1- or 2-day shipping on an order, well then this worked for me as of my last order about two weeks ago.
We also had a few of the "Just For Kids" VHS tapes growing up and it took me ages to track down info about the company down when I randomly remembered them a year or two ago. I absolutely loved "The Elmchanted Forest" as well as "Sampson and Sally" and "Katy and the Katerpillar Kids."
From what I found Just For Kids had bought the rights to some obscure Eastern European films from the 80's and dubbed them into English before they disappeared themselves which was a disappointment to me given the fond nostalgia I had for their movies. Took me forever to find the films I remembered because of that, but I did eventually.