I have been storing books for the next reading drive. I will earn 426,085,535 sP if all of them sell at their lowest price. Is it worth saving them for drive or would I be better off selling them and buying any useful weapons from user shops?

The reading drive is something that will not be occurring again. The prizes for it have already been added to the antique shop for purchase.

Thank you so much! How did I not know this? So that's sorted that dilemma for me :D