The company whose link you have provided (thanks!) are using the word beldi in a generic sense for the purposes of marketing. There are a couple of misleading statements in their advertising spiel. Firstly the rugs can be made from wool other than sheep and sometimes other materials can be incorporated. Secondly although these products can be produced by individual village ladies it is more common nowadays that womens' cooperatives (village cooperatives) help each other with the weaving and embellishments of the products. Thirdly (did I just write "a couple?") these are traditional rugs amongst the mountain Berber peoples and designs vary from village to village and individual to individual in the three Atlas ranges, not just the Middle Atlas. They are beautifully crafted pieces and well worth seeking out. As well as the villages near to the High Atlas outside of Marrakech you may also wish to visit Meknes to the north of Morocco as designs there offer another choice. Buying directly from the producers (and Marrakech acts as a vast clearing house for Moroccan products) rather than from a middleman makes more financial sense.
Involving yourself with a local community will give you an input to quality control and be able to discuss sizes, designs, colours and so on. If you intend to import in quantity then you might consider making a couple or more contacts in the country. As to price, sorry, I have no idea never having purchased one!
Edited: 10:04 am, March 27, 2013