Gina's iMac keyboard isn't very comfortable. Where can she get a new one? Jason recommends going over to thewirecutter.com and search for "Keyboards." Her Mac can use any keyboard out there, and in the System Preferences there's also an option to swap the Command and Option keys for those who need that preference.
Logitech makes a great Mac Keyboard, as does Kensington. But Matias.ca has a great mechanical keyboard. She can get a better one that works the way she wants it.