Well then ignore my post, lol. You could sell it to me for the low low price of 5 silver though, if you want.
. I promise if you provide the slime jelly, I'll provide the rest of the materials and give you free speed scrolls!!
But, seriously, try what Hessah said, start out at around 250 silver or 300 silver. But, I would never actually pay that, because the opportunity to make the actual scrolls will be rare, due to the rareness of slime jelly.