Obsidian sources, and the proportions of those sources represented in site collections, are known poorly in the southeast mesoamerican periphery. The Honduran sources of La Esperanza and Güinope are described and fingerprinted chemically, and the utilization of these obsidians is explored in selected sites in Honduras, Nicaragua, and Costa Rica. Although prehistoric Nicaraguans and Costa Ricans used obsidian from sources as far away as Honduras and Guatemala, most of their cutting tools were made from local materials, using informal manufacturing techniques. The analytical results indicate that the sources for two new types of obsidian have yet to be found they may lie in western Nicaragua.