You can get those from 'Mercure Hotel' [Known previously as Sofitel] ... some shops has it, but if you did not then try 'Radio Basheer' or 'Al Enabi' both the shops are so close to each other and are located near the 'Arab Bank' roundabout ... the old branch of course near 'Souq Nejadah'.

Wish you the best of the luck my friend.