sneek, I'd not wait for the TV series. It's the cheapest I've seen many of these ($13.99, 9.99 and $14.99). Sure sometimes they are $12.99 and 11.99, but the prices Amazon has now, beat full price, which they can be otherwise. I am not sure any of us can predict if they'll be even cheaper. I am guessing they won't be, and that they were simply remaining competitive with the B&M's, which had these very prices in their ads for tomorrow through Sat.
As for some of the new release Blus that Amazon has pictured, it looks like those will be $15 (presumably to match Walmart which is touting $15 BD's on those titles, per their flyer).