Hello Khory -
I don't know Dubai at all but, you can probably order on-line from Williams-Sonoma in the U.S. if you don't have shops there. They have writing pens. I have purchased various colors from them.
Here in L.A., we also have a restaurant supply shop that sells everything! They'll have the cady melts Merkins is best.
Good Luck. Shari AKA Kitchen Queen
If you have a problem, let me know.
re: Kitchen Queen
Can you get nice chocolates like Valhrona or Callebut or even Nestle's chocolate chips? Melt them and add vegetable oil a little at a time until it's almost like a soup and easy to dip and cover cakes. Then put into freezer to harden. Instead of writing pens, make royal icing and pipe that on the cake pops!