Recommend me an Ipod speaker

[crossy67]

We're off touring in a couple of weeks and want to take one of these small Piezo speakers with us. It must be rechargeable from a cigarette lighter (or 5v USB) needs to be as small and light as possible but I want something I will enjoy listening to. Budget is £25 but could be stretched a bit if really worth it. I@ve seen them on Amazon for £8 but worry what the quality would be like.

Any suggestions please?