I been trying to get in touch with a mod ingame, but with no luck.
My lava bukket is gone, and i dont know how to get a new one. I tried to ask in chat, if someone is selling also. No luck there either.
Im on.net
Dalan76

 

You cant buy lava buckets, but you can buy obsidian. A plugin is in place where when you right-click it.

 

Where can i buy obsidian ?

 

Lava bucket trading is illegal, but what you can do is try to trade someone for 3 iron ingots (they sell for like 2 grass each ingot, usually), and craft a bucket.

Then, like fromlegouniverse said, you can trade someone for an obsidian block and right click the obsidian block with the empty bucket.

Then, viola! You've got a lava bucket!

I'll be online tonight probably, I'll be happy to give you obsidian if you can't find any by then.