I decided I wanted to try using a wet palette since this wasn't really doing it for me anymore. So on my latest trip out for supplies I earmarked a tenner for this project.
I picked up a roll of parchment paper ($3.50), some left over bins ($2.98), and some basic sponges ($1.30) needed for the project. Snow-monster helps open the sponges... and every other packet of anything with seals like that.
I cut two sponges to fit comfortably in the left overs bin. Then I cut a piece of parchment paper off and trimmed it down so it covered the sponges nicely.
Just add water and the end result is a palette that ought to keep my paints at ready when I need to pause the action.
Now I get to figure out how exactly this thing works.