P/C> Advanced Gollux Scroll

I'm thinking about selling Advanced Gollux Scroll Service. Is there an average price that people will pay for them?

Also, I'm not really sure how the collateral process works. I have about 25 adv enhancement scrolls (the ones that boom), would that work as collateral or are equips/weapons preferred? I've never sold any type of scroll service before so I'm unsure. =/

Thanks!!