Have you seen the various posts about wet palettes? I have but was put off by the need for special paper to line the palette. I also wondered if the colours would stay separate. The latter is a particular problem as I nearly always dilute my paints.
Whilst looking in The Range for something else I found a small well palette for £1.00 GBP. I was going to use it as a regular palette but when I got home I realised it would fit nicely in a takeaway food container. So I decided to try it as part of a wet palette: