If you're running a booth at a convention, there are a couple of things you can do to lure in attendees. Say, having some sort of exclusive item they can purchase that has an awesome rating that breaks the scale. Take San Francisco-based toy company Super7 and its extremely limited run of 250 retro Alien Egg Chambers, which will only be available at this year's San Diego Comic-Con. Yes, you guessed right -- they can only be bought from Super7's booth.
You could easily show the above picture to someone and trick them into believing this was a real toy released back when Alien first hit cinemas. In reality it's an exclusive goodie that Super7 will be selling from its booth for $US100 a pop. Rather than being a cheap plastic novelty, the base is made from "durable hand-cast resin and corrugated cardboard", with the "full-colour" backdrop sliding in to complete the setup.
Sadly, the chamber doesn't come with the figurines shown on the front of the box -- you'll have to get those yourself.
If you're desperate for one, I'm sure a few will show up on eBay during the convention's run... at a healthy mark-up.