The most expensive Tulip Bulb ever sold was the Semper Augustus. Reliable historical sources show that a contract for a single bulb sold for 5,200 Guilders at the height of Tulip Mania, more than three times the typical yearly earnings of an Amsterdam merchant at the time. [https://amsterdamtulipmuseum.com]

https://www.forbes.com/sites/ceciliarodriguez/2023/04/16/tulip-mania-and-the-multimilliondollar-industry-behind-the-worlds-popular-flower/