A 2007 special titled "Da Vinci's Lost Code" on the Discovery Channel, featuring an interview with Dutch art dealer who bought it, stated the figure was $1500.
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In her 1967 book (published in English in 1985) Angela Ottino della Chiesa cites four paintings derived to some degree from The Virgin of the Rocks: the Holy Family and St. John by Bernardino Luini in the Museo del Prado in Madrid, the Thuelin Madonna by Marco d'Oggiono in the Thuelin collection in Paris and the Holy Infants Embracing by Joos van Cleve in the Capodimonte Museum in Naples.