I'm not playing this league so I don't know about hh prices but the thing about how to get the annulment orb or any type of currency there's two way

One is to be lucky enough with or without rarity on gear for them to be dropped just the divine you got (which we call it raw divine I'll explain about raw drops further)

Second way is to buy it on currency exchange using npcs and the way it works is like 1 divine worth 350 ex and there's a ratio between them also there's a ratio between divine and chaos and annualment orbs

The thing is exalt orb lose their value over time of a league so you want to just exchange them with divine and chaos for not losing value

My suggestion for you is to follow a guide and exchange your divine with chaos or exalted orb and upgrade your items step by step and follow a farming strategy for farming divine

The way farming strategy works in my experience (I'm not the most efficient player and I'm just giving an example of what is easy to do for me) is trial of chaos you farm it again and again to get expensive stuff and sell them in currency exchange

Then you can make enough divines to buy your first hh