Billy Stockman Tjapaltjarri ( 1927 - ) is an Australian painter. Billy Stockman Tjapaltjarri s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 4900.89 USD for Untitled in 2004 to 66474.63 USD for Rockholes near Olgas 2007 in 2007 , based on the size and medium of the artwork.