This page inventories remaining urethane molds, embedded in plaster as support. Once commissioned, molds that are in good-enough condition (I need to check a few) can be used again to cast in bronze (expensive), plaster, cold-cast bronze or bronzed resin (inexpensive), etc.
Secret Angel
Urethane mold for sale. Condition: good.
St. Francis of Assisi
Urethane mold for sale. Condition: good.
Gorilla
Urethane mold for sale. Condition: good.
Florence Nightingale
Urethane mold for sale. Condition: needs verification.

Florence Nightingale, life-sized. Image of bronze in the collection of the School of Nursing, University of California, San Francisco.
Maja
Urethane mold for sale. Condition: good.

Maya, 40 inches. Original image of wood carving, in collection of Piero Mussi. Bronze in collection of Steve Avilla.
Dancing Cherub
Urethane mold for sale. Condition: questionable.