"Saver shipping" refers to a shipping option that allows you to save money by opting for a longer delivery time. It typically takes a little more time for your package to be delivered, but you pay a lower shipping fee. Full definition
Update: Actually the later shipping date and later delivery date was because of super saver shipping. (dealsagar.com)
Another option is to grab a bag on Amazon — and if you order a copy of Practically Raw Desserts at the same time, you could even get the free super saver shipping deal. (chefambershea.com)
That free shipping has a 3 - 5 day window, however, in my experience (and since the UK isn't that big) anything I order from Amazon with Super Saver shipping gets to me in about 2 - 3 days. (knowyourmobile.com)