The version that I got of these was were excellent. Unfortunately, this is ANOTHER example of how AMZN will make 4 underwear for $17.95 and another month they can be $34.00 WHY?  Because they figured out to MEET their quarterly estimates for Wall St, they can 'pull' as much additional revenue from everywhere and everything when needed.
This works out against that silly little concept called free market pricing. There is no self regulation here, but it is all about AMZN choosing the price. And when on the news they claim "oh, that isn't something we do, it is all ran by computers." that is all garbage.
Also, the concept of a subscription for these things is misleading. First you think 'OK, I will be buying at $17.95." But there is NO assurance of a locked price. They can change it whenever they want. That is complete bait and switch..