Bella amasses a spreadsheet full of runes. She learns enough about programming to store them a bit more elegantly than that and get the program to make suggestions that do various results. Doesn't have a GUI wrapper, but it works for the part that is about choosing runes and sizes, if not laying them out - that still has to be done by hand.

Invisibility is going to be very popular with monsters who want to go out in the world.

As far as scrolls are concerned: Xeroxing them doesn't work. Carbon paper does, even on gray paper where the runes are barely visible for intellectual property reasons, and tracing a xeroxed copy also works fine; a simple spell takes about five minutes to make a stack of four. The spells are available in French and Spanish. There isn't a huge selection to start. But it's something.

They give Angela an after-school job tracing them according to demand so they have more time to discover additional runes and work out additional spells, and they put up fliers in the Avalon advertising a mail-order service.

Bella gets a car. It's a beat-up station wagon, but it works.

Bella has a small business, a vehicle, and a long-term career plan.

She sets about making arrangements to skip the eleventh grade, and Darren follows suit.

The two of them are adorably attached to each other. There is a lot of kissing. Savannah teases them a lot and Bella messes with her and Darren blushes.

By the time summer vacation starts, they have a stabilized price point, sufficient regular buyers, enough repertoire, and a nest egg of money that permit them to rent a small storefront and hire a teenage griffin to sell scrolls in the Avalon. They are on their way out (Savannah accompanying for kicks, Bella driving) to seal the deal and drop off a batch of inventory. Bright and early.