Subscription costs summary to build basic MR app on Quest 3 and eventually vision OS

A friend and I and I are starting to build a mixed reality App for Quest 3 and eventually port it to the Vision OS. I have looked far and wide and am unable to determine what license costs will be involved to build this app in Unity (given it will have a mixed reality mode) and whether there is a free option (ideal) until of course it scales to big bucks. Can someone please help with what toolkits I will need and whether I will need to dole out any subscription costs of whether Unity Personal will suffice (I sure hope so). Any answers appreciated!