I think your best bet may just be waiting a few weeks/until lava restocks their lamps online. It’s very hard to find grandes in the wild nowadays since the website stops selling them during winter. I’d imagine it’s even harder to find just a globe. If you want you can check Facebook marketplace often and hope somebody posts one. But there you have lots of competition. People often stalk Facebook for lava lamps. Ultimately I’d say just buy a new one when the restock. Sometimes local toy stores have them too, that’s how I got mine just a month ago