I have to update my list slightly, here are the rebloomers in my zone 5b/6a garden this year:
Thanks Two Friends was pretty exciting because it sent up two instant rebloom scapes (I only purchased two fans with two scapes to start with a month ago), and both have about 6-7 buds each (so far most rebloom scapes have just a few buds)
Olallie Keith Stone's Sunset was my first or second rebloomer this year. It's first bloom appeared on 7/4 and it's last (instant) rebloom ended around a week ago. Very prolific...I purchased two fans at the beginning of the season and it grew to about 8 fans PLUS made a pod out of nearly everything I put on it!
Peggy Jeffcoat threw a single rebloom scape with a single bud on a 2-3" scape. It was pretty pathetic, lol, but hey, it counts! She's still in a pot right now, so it might've been better if she were planted in the ground. I'll see what happens next year.