This is the cheapest copy I can find for this game, the link goes to the US website but I can confirm on my Switch that the selling price is 35.97 on the Australian Eshop.
Rated 75 on Metacritic and many other platforms
http://www.metacritic.com/game/switch/i-am-setsuna
The cheapest physical copy according to comparegames.com.au is around $80
http://www.comparegames.com.au/Switch/I-Am-Setsuna/prices/14…
edit: ozgameshop has physical copy for 67.99
https://www.ozgameshop.com/nintendo-switch-games/ikenie-to-y…
On the Canadian eShop it's CAD$25.19 (inc VAT) which works out to about AUD$25.50 if you use Nintendo eShop cards from PC Game Supply, although you would need to buy a CAD$35 card for AUD$35.43 to cover the CAD$25.19