Ooh, thats a tough one. Obviously the most valuable material is pure Null, which very few can create or harvest other than myself. So I guess a large quantity of Null? As for trinkets, most things with lots of Null are quite expensive. For example, I have an orb that, when activated, drains the souls of everyone on a planet, and any surrounding planets if their near enough. Along with the expensive stuff, there's also a few cheaper necessities, such as a key that allows you to access your pocket dimension at any time by opening a gateway in front of you without requiring a door. Also, if you don't have the time or resources to allocate enough power to keep a pocket dimension open, I provide a service to host on for you.

I'll take all of it.

Well I mean, if you'd like all the Null in the universe, which would just consume the universe, there's that, but as for my full supply of Null, I can't really measure it's value in currency.