When I click on the link amazon shows me a price of $92.49 for the blu ray version (and not r $68.99).
In my browser amazon knows my account (and my amazon prime info). I suspect that this is an example of Amazon doing dynamic pricing. "They" know I like sci-fi it seems and know they are likely to get lucky in charging me more. :/. Or maybe this deal was just a very short duration special.
In either case. Thanks for the info about the show.