hello..Tourareg is one of my favourite native army...i'm referring to Touaregs from Niger, Mauritanie ecc..that fougt in early XX c. vs the French Saharian Méharistes and Tirailleurs sénègalais....in this case some few warriors were equpped with shields and spears/swords...in one account of the famous small battle between méharistes and touaregs ...there is a descriprion of camel charge with warriors trowing spears..then dismounting with sword in one hand and rifle plus shieldd in another...as regards to available 28mm shields i can count only those manufactures that have minis with a separate Touareg shield...Blaze Away camel mounted arabs, Black hat /Unfeasibly, Willie (spencer smith)...this last one is a simple shaped piece of metal..maybe you can just write them and try to let them sell you a customised pack of spare shileds among your order...but if i was you i would simply suggest you to make your own shields as i did for my few Redoubt Touaregs....given the few needed, the simple/flat and irregular design you can easily acieve your result by cutting it from cardboard, gluing to the figure or the back of the camel saddle and then fix it with a wash of white glue.