I found it at my local true value.. I'm sure you could get your hardware store to carry it, if they don't already. Very nice though.
Of course, I cleaned the boot with window cleaner and made sure it was nice and warm.. But the tape feels like it's got some silicone in it. Easy to do one unbroken wrap. Stupidly, I didn't. Don't think it's going to be a factor tho'.
But, I'd recommend starting from the top and just working your way down in one strip. Obviously like wrapping a pipe. I almost considered wrapping each of the ends with a srtip of gorilla tape, but it didn't look like it needed it. Now, it looks and feels re-inforced. No word on long term yet, but you get so much of that tape, you could do it a few times...