Ebay offers Type S Plug & Glow 24" Multi-Color LED Car Trim Kit for $12.99 (reg $34.49) with free shipping.

Product Description:
If you're looking for a way to add a little bit of extra visibility to the interior of your car, you may want to consider interior lighting. LED lights are a great way to improve your car's cabin. Overall, the best light kits with custom multi-colors will let you personalize your car. The TYPE S Plug & Glow 24"" Multi-Color LED Kit has durable lights with a plug-in power option, is water-resistant, and has an adaptable fit that will let you tailor the lights to any area of your car without taking up too much space.

• Dimensions (Overall): 2 Inches (H) x 1 Inches (W) x .17 Inches (D)
• Weight: .5 Pounds
• Material: Plastic
• Power Source: Car-Powered
• Battery: No Battery Used