If they have roots on them they are ready to go. I'd probably sell them for 1.50 or so personally. 6-8" plants are usually $3 give or take. Dustin isn't a good reference on pricing because nearly all of his stuff is extremely overpriced imo.
Yeah I agree he has some expensive stuff. Very high quality though. Stem plants with ROOTS haha.
Most plant bunches have roots on them unless they are just cut, it only takes a few days to form them. It's not any different than ordering from any other place, they are all getting their stuff from the same handful of suppliers. The only big difference is you end up paying 2-3x more than any other place charges.
I've heard lots of good things about them. Might have to try em out