Given the following context:

Since his death, Thomson's work has grown in value and popularity. Group of Seven member Arthur Lismer wrote that he "is the manifestation of the Canadian character". Another contemporaneous Canadian painter, David Milne, wrote to National Gallery of Canada Director H. O. McCurry in 1930, "Your Canadian art apparently, for now at least, went down in Canoe Lake. Tom Thomson still stands as the Canadian painter, harsh, brilliant, brittle, uncouth, not only most Canadian but most creative. How the few things of his stick in one's mind." For Canadian artists Roy Kiyooka and Dennis Lee, he is a "haunting presence" and "embodies the Canadian artistic identity".As of 2015, the highest price achieved by a Thomson sketch was Early Spring, Canoe Lake, which sold in 2009 for CAD$2,749,500. Few major canvases remain in private collections, making the record unlikely to be broken. One example of the demand his work has achieved is the previously lost Sketch for Lake in Algonquin Park. Discovered in an Edmonton basement in 2018, it sold for nearly half a million dollars at a Toronto auction. The increased value of his work has led to the discovery of numerous forgeries on the market.In 1967, the Tom Thomson Art Gallery opened in Owen Sound. In 1968, Thomson's shack from behind the Studio Building was moved to the McMichael Canadian Art Collection in Kleinburg. Many of his works are also on display at the National Gallery of Canada in Ottawa, the Art Gallery of Ontario, and the McMichael Canadian Art Collection in Kleinburg, Ontario. His influence can be seen in the work of later Canadian artists, including Joyce Wieland. In 2004, another historical marker honouring Thomson was moved from its previous location near the centre of Leith to the graveyard in which he is now buried. The grave site has become popular spot for visitors to the area with many fans of his work leaving pennies or art supplies behind as tribute.

answer the following question:

What is the full name of the person who sold a piece for nearly half a million dollars at a Toronto auction? 

Tom Thomson