If you're after a physical copy of this game for the Switch, you won't find cheaper.
On sale for $34, combined with the Extra 10% off Online Shopping code, brings the cost down to $30.60 if you can click and collect.
Fair warning, this game has been significantly cheaper for a digital copy, and remains cheaper than this price on the Nintendo eShop.
The Voidheart Edition is also available on Gamepass, and was previously free via Playstation Plus.
Why do people want a physical copy? Seems actively worse in terms of usefulness (having to switch) but some small resale value maybe?