Can I buy anything for the computer?

Hint 1 of 8:

Yes, you can buy something, but not anything on the shelves.

Hint 2 of 8:

Look at what is on display, though.

Hint 3 of 8:

Ask the clerk about the software.

Hint 4 of 8:

He will soon offer you another cartridge.

Hint 5 of 8:

Yeah, you need this cartridge.

Hint 6 of 8:

Maybe he'd be up for a trade.

Hint 7 of 8:

Take out your Adventure cartridge.

Hint 8 of 8:

Trade it for the recipe cartridge.