Hi Ariel,
Shibriyas are not that common on the international market, mostly becuase of lack of familiarity and/or interest. The exception are contemporary tourist ones made in and around Amman, Jordan. I understand the lack of interest. After all these not exactly high points of Islamic craft, but I think that they are legitimate ethnographic items and they are fun to collect. Why? Because of the large variety of types and materials, including recycled "modern" materials like early plastics, electrical wires etc. Few devoted local collectors in Israel own hundreds of them which they bought for nearly nothing, including many old and unique examples. We do try to get more information on their history and development, but sources are lacking
