Here's the entry: Marktplaast
My personal advice is to never buy anything unless it can be authenticated and it is legal and ethical to do so. Using this rule, most of the cultural heritage being plundered and lost on shady sites like eBay can be quickly excluded. Most of it is bullshit made in Algerian slums by slummy people, but every now and then a priceless artifact shows up in a garage sale.
I'm highly skeptical of the authenticity of the "beaker" above.