In 1998, the Metropolitan Museum of Art in New York bought Johns' "White Flag". While the Museum would not disclose how much was paid, "The New York Times" reported that "experts estimate painting's value at more than $20 million". The National Gallery of Art acquired about 1,700 of Johns' proofs in 2007. This made the gallery home to the largest number of Johns' works held by a single institution. The exhibition showed works from many points in Johns' career, including recent proofs of his prints. The Greenville County Museum of Art in Greenville, South Carolina, has several of his pieces in their permanent collection.