I have a couple left, but they're broken. Sorry man, I couldn't resist. Rhetorical question- Why would someone upgrade unless they actually needed to because of breakage?
Seriously though, you're better off buying new if you can, even if you just want 30's. They don't cost that much, 35's go for around $75 each, and 30's may be a bit less. The problem you can have with used is that they may have some twist already and if you don't install them in the same direction as they were before, they'll snap like twigs if they're stressed. If they were marked when removed, you might be OK. Good luck.