I took up painting as a hobby about a year ago which is when my search for the perfect palette began. After having searched for an easy to clean but inexpensive palette, I came across this at my local Walmart:
I got 2 of these plates and have been using them. They require no effort to clean (like you would expect from a peel off palette).
I have come across artists who use use-and-throw plastic plates as palettes. However, I find these plates are better as they are more durable.