For the western style orchestral card, call Maqam music or check the Ketron US web link I am listing below. THis card sells for $210 and comes with floppy disks that you can load to the flash card.
http://www.ketronus.com/accessories.html For the Lebanese, card, Check the link to the MIDI Eastern web forum which has a discussion thread on Ketron keyboards, and there are many persons there that have bought the Lebanese card for $400. This card does not come with floppy disks so you can only use it for the sounds it comes with.
Here is the link to the forums
http://www.abdallahsafar.com/Forum/