Have you looked at used or refurbished models? Try checking the pawnshops. Repair shops sometimes have stuff for sale when the customer never returns to pay for repairs. Sometimes, new stuff is available in overstock sales.

Just a cursory look on Amazon found this iMac for $235

https://www.amazon.com/Apple-21-5-inch-3-3GHz-ME699LL-Refurbished/dp/B078ZN23LV/ref=sr_1_1?crid=2I7JQ6KYUNQ8Z&keywords=imac&qid=1687177401&refinements=p_89%3AApple&rnid=2528832011&s=electronics&sprefix=imac%2Celectronics%2C88&sr=1-1