I’m Canadian now but kept my Hungarian SIM, still paying it to this day after seven years. It’s 9EUR/mo for some paltry amount of data, but mostly just using it for online services that require a Hungarian or European phone number for MFA. I just bought extra data that counted as EU wide roaming data when I last visited.
However the options for my wife were very limited as a non-EU traveller. I think it was €30 or something for ~5GB of data usable in Hungary only and limited to ten days (we stayed for 14) and added as an eSIM with the help of an app/website. It was not transferable to other EU member states, and this was one of the best deals we could find that did not require us to go to a physical store location. This included us checking offers for prepaid SIMs from the major providers (Vodafone / -Mobil / Yettel)