All good things come to an end, Amazon has now increased the minimum amount required to get free Super Saver shipping from $25 to $35. This includes most physical goods sold by Amazon itself or fulfilled by Amazon. Magazines also count towards the $35 limit, but digital content purchases (ebooks, mp3s, digital video, software downloads, apps, etc) do not count towards the $35 limit. Also not counting are products purchased from third-party/marketplace sellers that ship directly from the marketplace sellers.
The tech blogs are speculating that this a move by Amazon to encourage more people to try out Amazon Prime with a 30-day Free Trial. For $79 for every 12 months, you get free 2-day shipping for qualifying items (sold and shipped by Amazon itself and fulfilled by Amazon warehouses), along with an increasing number of TV shows and Movies to watch for free, and one new Kindle e-book rental per month.
The Amazon Add On Program
One feature that was quietly effectively removed from the Prime program the last few weeks/months is free shipping on some small items that cost under $5 (not every sub-$5 item, but some of them). Amazon calls this the "Add On Program". Amazon's explanation is that these are items that they wouldn't be able to carry otherwise, but by adding this restriction, they are now able to carry them.
In order to be allowed to buy "Add On Program" items, your purchase total must be $25 or more, regardless of Prime member status. Even if you want to pay shipping out of your own pocket, the shopping cart won't let you buy them. As of now, the minimum purchase limit for these remains $25, it hasn't increased to $35.
And here is an example of a sub-$5 item that is not part of the "Add On program": iPhone 5 screen protector for $3.50. In other words, you can buy it for $3.50 and get free 2-day shipping.