Hey.
Classical guitar strings are available at the Yamaha Music Centre beside Jarir Bookstore. If you don't know where that is, it's near Ramada hotel.
:)

When I went to buy my set a week ago, it cost 59 riyals, if I recall correctly.

Just tell any of the staff there what it is that you're looking for, and they're sure to help.

- Lavinia.