When a player gets turned to stone by a beholder they either need to hope someone found a rather rare spell scroll drop or that a DM is on and feeling merciful. I think it'd great if these scrolls were available somewhere so that players could prepare themselves for that possibility better.
Ordinant players in particular (of which I am one) are probably some of the most likely to end up petrified from Beholders. If no where else, I think it'd be fitting if stone to flesh scrolls/trinkets/whatever were available at the society vendor.
Added. Please let me know if the favor cost seems too cheap or expensive.
I think it's too expensive at the moment if the gold price is intended alongside the favour. If the gold price isn't intended then I think it has bugged out slightly.
Gold isn't intended. Fixed.