- In May 2022, a large oil painting by William Hallett titled "Salmon River, Fighting Bass" sold for approximately $162,500 at auction in the United States. The painting measured around 28 by 48 inches and was signed and dated by the artist.
- In October 2021, another large oil painting by Hallett titled "Leaping Salmon and Fighting Bass" sold for about $106,250 at auction in Canada. This piece was also significant in size and bore the artist's signature.
- In January 2021, a smaller oil painting by Hallett, measuring 12 by 22 inches and depicting a similar scene of leaping salmon and fighting bass, sold for roughly $35,000 at auction in the United Kingdom.
Please note that these prices are just a few recent examples and may not represent the current market value. It's essential to consult reputable art experts or auction houses to obtain the most up-to-date and accurate valuation of a particular William Hallett painting.