I've been using the Singed Stuffing scroll and I just made a Terra Focujin Scroll as an upgrade. All the good scrolls are almost impossible to obtain/super expensive so I don't know what else I should be using?

Why not two cobalt eternal scrolls? They block a large amount of fire/earth/dark/physical/ice though they are OPB (why I recommended two instead of one).

I'd suggest a morosbane scroll. It's a really effective scroll at low tiers though it's once per battle, it can surely add some wins on opponents and make others easier.