There are plenty of cool lava lamps on the market these days. While they are not all expensive, you don’t have to spend a fortune to build your own. This Mini Lava Lamp Kit comes with everything you need to get started. You simply have to combine oil, water, and tablets, and you are set. Once the reaction is complete, you will have your own mini lava lamp.
This DIY science kit is available for under $10 at this time.