For those who are selling Spell and Melee Vouchers the price is the same as Arcane Scraps!
Why? With Arcane Scraps you can exchange your vouchers for low level and not worthy skills at all, only some of them worth, therefore Arcane Scraps worth between 5b - 8b actually!
Then, Spell V and Melee V vouchers must worth same or even higher than 1 Arcane Scraps, because you can exchange for high level skills that you won't get in lucky bags, another reason are those skills are temporary.
Therefore, Spell V and Melee V Vouchers worth 5b or higher each one!
I have nothing else to say!
Enjoy the game!