I have the Mopar soft top boot and love it! Exactly the same material and quality as the soft top itself. It was a VERY tight fit at first but a good hot sun and some stretching was all it needed.
I got it on Amazon for $170 I think. At first glance it still seems a lot more expensive than the other options but when you consider this one comes with nice storage bags for your soft windows I thought it was a good value. And I had read both good and bad reviews about the figment of all the other options so I didn't really want to take a chance.
Edit: And yes, it does completely eliminate any fluttering.