Well, we skip the PFF - because the lines can be huge and incredible and for toddlers, that's just a no-go. I didn't realize they did hair there though. We do Ariel's Grotto for our princess time.
I actually love Libby Lu - the stuff smells nice, not icky perfumey, is nice and glittery, they have a real firm grasp on what's hot for little girls without going overboard or making your daughter look, well, in a way a mom wouldn't be too happy with. They're young and hip and it's a neat experience - of course the music video thing would be cool to have forever too! It's a Bath & Body Works type thing for little girls - with sparkles, gotta have those! Plus they have the make a pooch things too - so if something isn't going well with your child, you have options to switch gears there.
The discount ranges - I believe it's around 10% but sometimes around 20%?