Hello there! At Dracomere spawn I currently have quite a few chests set up to buy dirt for our farms, since it's going to need quite a lot of dirt to build them all.
At the spawn I'm buying dirt for 160nbz a stack, the same price as /vipshop. They're set up so that you can sell a full inventory with a single click.
If you find that all the chests are filled up let me know on here or send me a mail so that I can empty them!