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Everything you will ever need for the period (though a bit dated now)http://www.warflag.com/shadow/The Red Shadow's Wind and the Lion Page http://www.warflag.com/shadow/windlion/windlion1.htm
Artizan do a very small range of North Africans, including Moroccans and one pack of Tuareg.They also do Arabs for the Arab Revolt in their WW1 range. I know they aren't quite right, being Arabs from Arabia rather than North African Berbers, but sometimes you have to go with the best you can manage, considering there isn't a massive amount in the way of options.Edit: Apologies to traveller. I somehow missed that he already mentioned Artizan.