Here's a little tip, from a little tomato; Take a look.
As weird as it sounds, best price comparison site for the eShop has PlayStation origins; yes, you heard that right.
https://psprices.com/region-es/index?platform=Switch
There is a price change history and discount subscriptions, everything a price comparison site should have.
You can even have a wish-list with all your digital desires: https://psprices.com/wish-list/HRNfGKEG
This ad was sponsored by psprices. I am in no way, shape or form affiliated with any of the services mentioned here and do not in any way profit from commissions or referrals to any of them