According to the search results, the most expensive Lego minifigure is the Solid Gold 14K C-3PO, which was released in 2007 to celebrate the 30th anniversary of the Star Wars franchise. It is valued at around $200,000. However, it is worth noting that there are other rare and valuable minifigures, such as the bounty hunter from 10123 Cloud City, which was released in 2003 and is valued at around $1,700. Additionally, there are minifigures that were never made for the general public, such as aluminium minifigs of Jupiter, Juno, and Galileo, which are priced at just slightly north of $2 billion for the set.