https://www.cnet.com/news/imac-2017-vs-imac-2019-how-the-specs-compare/

The base 21.5-inch, non-Retina model remains the same, sticking with its $1,099 (£1,049, AU$1,699) price tag.

We hope that these internal upgrades don't preclude an iMac redesign this year, though. While the good news is these enhancements come without concomitant price increases, the bad news is that the system's design was already getting old in 2017 and some of the core features, like wireless networking and Bluetooth, could stand some upgrades.