Fact: It is often ridiculously cheaper to buy physical DVDs off Amazon than to purchase the same material in an existing digital format from your vendor of choice, like iTunes. Case in point, a friend of mine and I recently started watching Conviction, a one-season series that broadcast a few years ago.
Shipped via Amazon Prime (unfortunately not Amazon Prime Air), the three-disc set cost all of US$3-7 depending on which day you shopped for it. Amazon prices jump around a lot day by day. The same series would have cost $20 at iTunes. Ripping DVDs does take extra time -- both for shipping the product as well as performing the rips, but the results are satisfying.