https://www.amazon.com/dp/B09G3HTJZX/ref=dp-kindle-redirect?_encoding=UTF8&btkr=1
This link right here has got you. $20 for an amazing collection that includes some of the best comics ever done.
It's from Marvel Comics Presents issues 159-161. It's a story where US Agent tracks down Clint who has been hiding in the Tennessee wilderness after the death of Mockingbird. It's a fun little story.
It's also available in the Hardcover: "Hawkeye: Earth's Mightiest Marksman" a really nice collection.
Oh, I wish! The only Avengers non-graphic novel I know of is New Avengers: Breakout, which is yet another AU, so don't expect MCU or 616. http://www.amazon.com/New-Avengers-Breakout-Prose-Marvel/dp/0785165177