The Witches' Market (Mercado de Hechiceria or Mercado de las Brujas) is on Calle Linares between Sagarnaga and Santa Cruz. Vendors sell herbs, llama fetuses and dried frogs for Aymara rituals, as well as soapstone figurines and aphrodisiac formulas. Reference: http://wikitravel.org/en/La_Paz_(Bolivia)#b